diff --git a/bun.lock b/bun.lock
index c94440c4b..84d73f6db 100644
--- a/bun.lock
+++ b/bun.lock
@@ -10,6 +10,7 @@
         "@hyperframes/player": "workspace:*",
         "@types/node": "^25.0.10",
         "concurrently": "^8.2.0",
+        "fallow": "^2.75.0",
         "happy-dom": "^20.9.0",
         "knip": "^6.0.3",
         "lefthook": "^2.1.4",
@@ -517,6 +518,22 @@
 
     "@exodus/bytes": ["@exodus/bytes@1.15.0", "", { "peerDependencies": { "@noble/hashes": "^1.8.0 || ^2.0.0" }, "optionalPeers": ["@noble/hashes"] }, "sha512-UY0nlA+feH81UGSHv92sLEPLCeZFjXOuHhrIo0HQydScuQc8s0A7kL/UdgwgDq8g8ilksmuoF35YVTNphV2aBQ=="],
 
+    "@fallow-cli/darwin-arm64": ["@fallow-cli/darwin-arm64@2.75.0", "", { "os": "darwin", "cpu": "arm64" }, "sha512-izJTjYPNdiWPbf7QjVwje0JwJeVQJAUuncjPkuAO9hRM3t4oJ9fqAvyEXyyRq4dAJS4NO4DMEsPsN82QOF8fGw=="],
+
+    "@fallow-cli/darwin-x64": ["@fallow-cli/darwin-x64@2.75.0", "", { "os": "darwin", "cpu": "x64" }, "sha512-hZzaSidHYKFC82bjP/L+xKOp67ESgNjSUX3U2HzaBg/dKFVcyMFxub3O7r3SBFBU2zY5wsZK1qmfpw/oC01vsg=="],
+
+    "@fallow-cli/linux-arm64-gnu": ["@fallow-cli/linux-arm64-gnu@2.75.0", "", { "os": "linux", "cpu": "arm64" }, "sha512-K5ymLWqR6NJUV+wVDFK0+bKK4YSzYo9Lr2Xla5YptW6FnlpEAvRDdcr3lGdf3Ge1T14fKU3ys8dKHDHkJSeyeA=="],
+
+    "@fallow-cli/linux-arm64-musl": ["@fallow-cli/linux-arm64-musl@2.75.0", "", { "os": "linux", "cpu": "arm64" }, "sha512-FRBz19XQ6pPjnhsIry0w0cRqUEYGZH6rEDCau3SGa2DNgts/i4573HJOn7ZRAzgSNMtgoh3KKTyUNOEzNLTl0A=="],
+
+    "@fallow-cli/linux-x64-gnu": ["@fallow-cli/linux-x64-gnu@2.75.0", "", { "os": "linux", "cpu": "x64" }, "sha512-81xmIf9G8hVTKbQGRGV6oTbu9W5XQPpKFpfXS3KFu16bbdgfwEaKzr5E7Y7dxECYsskhIiff5zdHcEPOFv29Wg=="],
+
+    "@fallow-cli/linux-x64-musl": ["@fallow-cli/linux-x64-musl@2.75.0", "", { "os": "linux", "cpu": "x64" }, "sha512-lVPjmM+dGy3NG6nJ9PaZfkUClZC6OyfwyqVZdQFhq+6Xl/2c2jZI9vgmwIDBIGBhL9TU+V8NdSM7Xy85ifeOyw=="],
+
+    "@fallow-cli/win32-arm64-msvc": ["@fallow-cli/win32-arm64-msvc@2.75.0", "", { "os": "win32", "cpu": "arm64" }, "sha512-HbIXLbte8pzNX0XlbyRlRQA2+y8kfJ4O6XxB2VR2dE6q5LrNhG4fl0QRR/P9x8r3CNn9fw/25kk+WxULfbHu1w=="],
+
+    "@fallow-cli/win32-x64-msvc": ["@fallow-cli/win32-x64-msvc@2.75.0", "", { "os": "win32", "cpu": "x64" }, "sha512-h8W+qEOPvyolBQO2Y0H4/pz2XXw/1yHA8/XRPo3/tYRovmN2zoNjDrvaGjjodzFt6fBVLus+T0uo+U4pMgOu/w=="],
+
     "@fontsource/archivo-black": ["@fontsource/archivo-black@5.2.8", "", {}, "sha512-3zNj/o9LzWyDl/UEpY5IOHpAQyUtFr3hQaFS7NSKwCLLkXOfH/CMCt1L2b2Z+OF25OURtOYenCadgAebALz7/A=="],
 
     "@fontsource/eb-garamond": ["@fontsource/eb-garamond@5.2.7", "", {}, "sha512-V42tTlHDbnDo0+lENnXKWMx63Llq6Gfl2l7ozkoeRQN60S0jm6hEgCLlOT/5YyKAN9QZ0e2ofpy0rGKlz9jBrw=="],
@@ -1243,6 +1260,8 @@
 
     "extract-zip": ["extract-zip@2.0.1", "", { "dependencies": { "debug": "^4.1.1", "get-stream": "^5.1.0", "yauzl": "^2.10.0" }, "optionalDependencies": { "@types/yauzl": "^2.9.1" }, "bin": { "extract-zip": "cli.js" } }, "sha512-GDhU9ntwuKyGXdZBUgTIe+vXnWj0fppUEtMDL0+idd5Sta8TGpHssn/eusA9mrPr9qNDym6SxAYZjNvCn/9RBg=="],
 
+    "fallow": ["fallow@2.75.0", "", { "dependencies": { "detect-libc": "2.1.2" }, "optionalDependencies": { "@fallow-cli/darwin-arm64": "2.75.0", "@fallow-cli/darwin-x64": "2.75.0", "@fallow-cli/linux-arm64-gnu": "2.75.0", "@fallow-cli/linux-arm64-musl": "2.75.0", "@fallow-cli/linux-x64-gnu": "2.75.0", "@fallow-cli/linux-x64-musl": "2.75.0", "@fallow-cli/win32-arm64-msvc": "2.75.0", "@fallow-cli/win32-x64-msvc": "2.75.0" }, "bin": { "fallow": "bin/fallow", "fallow-lsp": "bin/fallow-lsp", "fallow-mcp": "bin/fallow-mcp" } }, "sha512-0/2cquNI/cDLP/LzcCbkwI4hMzkX4tE0VY3/69n3PBBeqFpbM2oai+2Cb0sB8dXB8MDUGPVoPJjDW5GiUo7a1A=="],
+
     "fast-deep-equal": ["fast-deep-equal@3.1.3", "", {}, "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="],
 
     "fast-fifo": ["fast-fifo@1.3.2", "", {}, "sha512-/d9sfos4yxzpwkDkuN7k2SqFKtYNmCTzgfEpz82x34IM9/zc8KGxQoXg1liNC/izpRM/MBdt44Nmx41ZWqk+FQ=="],
diff --git a/lefthook.yml b/lefthook.yml
index 237bd82ca..b2ea46992 100644
--- a/lefthook.yml
+++ b/lefthook.yml
@@ -12,6 +12,14 @@ pre-commit:
     typecheck:
       glob: "*.{ts,tsx}"
       run: cd packages/core && bunx tsc --noEmit && cd ../studio && bunx tsc --noEmit
+    # Mirrors the CI gate (same `--base origin/main` so the local hook can't
+    # pass on a branch CI would fail). Audits the working tree, which means
+    # unstaged WIP in `packages/**` is part of the diff — stash before
+    # committing if that surprises you. `--gate new-only` (the default) only
+    # fails on issues introduced by the branch, not inherited findings.
+    fallow:
+      glob: "packages/**/*.{ts,tsx,mts,cts,js,jsx,mjs,cjs}"
+      run: bunx fallow audit --base origin/main --fail-on-issues
     filesize:
       # Scoped to packages/studio — the 500 LOC limit is a studio architecture
       # standard enforced as part of the App.tsx decomposition work. Player and
diff --git a/package.json b/package.json
index 11ac3ade0..4c8c81423 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "@hyperframes/player": "workspace:*",
     "@types/node": "^25.0.10",
     "concurrently": "^8.2.0",
+    "fallow": "^2.75.0",
     "happy-dom": "^20.9.0",
     "knip": "^6.0.3",
     "lefthook": "^2.1.4",
diff --git a/packages/aws-lambda/src/s3Transport.ts b/packages/aws-lambda/src/s3Transport.ts
index 988ae2a62..0c74d378f 100644
--- a/packages/aws-lambda/src/s3Transport.ts
+++ b/packages/aws-lambda/src/s3Transport.ts
@@ -22,11 +22,10 @@ import {
   createWriteStream,
   existsSync,
   mkdirSync,
-  readdirSync,
   rmSync,
   statSync,
 } from "node:fs";
-import { dirname, join } from "node:path";
+import { dirname } from "node:path";
 import { pipeline } from "node:stream/promises";
 import { GetObjectCommand, PutObjectCommand, type S3Client } from "@aws-sdk/client-s3";
 import * as tar from "tar";
@@ -138,19 +137,3 @@ export async function untarDirectory(tarballPath: string, destDir: string): Prom
   mkdirSync(destDir, { recursive: true });
   await tar.extract({ file: tarballPath, cwd: destDir });
 }
-
-/** List all regular files under a directory, sorted, returned as absolute paths. */
-export function listFilesInDirectory(dir: string): string[] {
-  const out: string[] = [];
-  function walk(d: string): void {
-    for (const entry of readdirSync(d, { withFileTypes: true }).sort((a, b) =>
-      a.name < b.name ? -1 : a.name > b.name ? 1 : 0,
-    )) {
-      const full = join(d, entry.name);
-      if (entry.isDirectory()) walk(full);
-      else if (entry.isFile()) out.push(full);
-    }
-  }
-  walk(dir);
-  return out;
-}
diff --git a/packages/cli/src/browser/manager.ts b/packages/cli/src/browser/manager.ts
index fc1c9999a..a29c943e4 100644
--- a/packages/cli/src/browser/manager.ts
+++ b/packages/cli/src/browser/manager.ts
@@ -13,12 +13,6 @@ const CACHE_DIR = join(homedir(), ".cache", "hyperframes", "chrome");
 // too or it silently picks system Chrome over a perfectly good headless-shell.
 const PUPPETEER_CACHE_DIR = join(homedir(), ".cache", "puppeteer", "chrome-headless-shell");
 
-/** Override browser path via --browser-path flag. Takes priority over env var. */
-let _browserPathOverride: string | undefined;
-export function setBrowserPath(path: string): void {
-  _browserPathOverride = path;
-}
-
 export type BrowserSource = "env" | "cache" | "system" | "download";
 
 export interface BrowserResult {
@@ -61,10 +55,6 @@ function whichBinary(name: string): string | undefined {
 }
 
 function findFromEnv(): BrowserResult | undefined {
-  // --browser-path flag takes priority
-  if (_browserPathOverride && existsSync(_browserPathOverride)) {
-    return { executablePath: _browserPathOverride, source: "env" };
-  }
   const envPath = process.env["HYPERFRAMES_BROWSER_PATH"];
   if (envPath && existsSync(envPath)) {
     return { executablePath: envPath, source: "env" };
diff --git a/packages/cli/src/capture/assetCataloger.ts b/packages/cli/src/capture/assetCataloger.ts
index be174548e..3bcd7e7da 100644
--- a/packages/cli/src/capture/assetCataloger.ts
+++ b/packages/cli/src/capture/assetCataloger.ts
@@ -288,76 +288,3 @@ function getWidthParam(url: string): number {
     return 0;
   }
 }
-
-/**
- * Format cataloged assets as markdown for the DESIGN.md Assets section.
- * Matches Aura.build's format: grouped by type, named from file paths.
- */
-export function formatAssetCatalog(assets: CatalogedAsset[]): string {
-  if (assets.length === 0) return "No assets detected.\n";
-
-  // Group by type
-  const groups: Record<string, CatalogedAsset[]> = {};
-  for (const a of assets) {
-    const group = a.type;
-    if (!groups[group]) groups[group] = [];
-    groups[group]!.push(a);
-  }
-
-  const lines: string[] = [];
-
-  // Output in order: Fonts, Images, Videos, Icons, Background, Other
-  const order: CatalogedAsset["type"][] = ["Font", "Image", "Video", "Icon", "Background", "Other"];
-  for (const type of order) {
-    const group = groups[type];
-    if (!group || group.length === 0) continue;
-
-    const sectionName =
-      type === "Font"
-        ? "Fonts"
-        : type === "Image"
-          ? "Images"
-          : type === "Video"
-            ? "Videos"
-            : type === "Icon"
-              ? "Icons"
-              : type === "Background"
-                ? "Backgrounds"
-                : "Other";
-    lines.push(`### ${sectionName}`);
-
-    for (const a of group) {
-      const name = a.notes || deriveAssetName(a.url);
-      const contexts = a.contexts.join(", ");
-      lines.push(`- **${name}**: ${a.url} — contexts: ${contexts}`);
-    }
-    lines.push("");
-  }
-
-  return lines.join("\n");
-}
-
-/**
- * Derive a human-readable name from a URL's file path.
- * E.g., "ConnectBentoBackground.jpg" → "Connect Bento Background"
- */
-function deriveAssetName(url: string): string {
-  try {
-    const u = new URL(url);
-    const path = u.pathname;
-    // Get filename without extension
-    const filename = path.split("/").pop() || "";
-    const nameWithoutExt = filename.replace(/\.[^.]+$/, "");
-    // Remove hash suffixes (e.g., "Sohne.cb178166" → "Sohne")
-    const cleaned = nameWithoutExt.replace(/\.[a-f0-9]{6,}$/, "");
-    // Convert camelCase/PascalCase to spaces
-    const spaced = cleaned
-      .replace(/([a-z])([A-Z])/g, "$1 $2")
-      .replace(/[-_]/g, " ")
-      .replace(/\s+/g, " ")
-      .trim();
-    return spaced || filename;
-  } catch {
-    return "Asset";
-  }
-}
diff --git a/packages/core/src/parsers/htmlParser.ts b/packages/core/src/parsers/htmlParser.ts
index 384b65f53..23fae3a2b 100644
--- a/packages/core/src/parsers/htmlParser.ts
+++ b/packages/core/src/parsers/htmlParser.ts
@@ -10,7 +10,6 @@ import type {
   StageZoomKeyframe,
   CompositionVariable,
 } from "../core.types";
-import { CANVAS_DIMENSIONS } from "../core.types";
 import {
   parseGsapScript,
   validateCompositionGsap,
@@ -902,5 +901,3 @@ function extractGsapScript(doc: Document): string | null {
   }
   return null;
 }
-
-export { CANVAS_DIMENSIONS };
diff --git a/packages/engine/src/services/hdrCapture.ts b/packages/engine/src/services/hdrCapture.ts
index 91494244b..2d2975780 100644
--- a/packages/engine/src/services/hdrCapture.ts
+++ b/packages/engine/src/services/hdrCapture.ts
@@ -158,46 +158,6 @@ export async function initHdrReadback(page: Page, width: number, height: number)
 
 // ── HDR frame conversion ──────────────────────────────────────────────────────
 
-/**
- * Convert raw rgba64le pixels (from FFmpeg) to a base64 string for FFmpeg encoding.
- *
- * For HLG sources: the pixel values are already HLG-encoded. We pass them through
- * as-is (normalized to 16-bit) and tag the output as HLG. No OETF conversion needed —
- * the HLG signal values ARE the correct encoding. Converting to linear and back to
- * PQ produces worse results because every viewer's PQ→display tone-mapping differs
- * from its HLG→display tone-mapping.
- *
- * The WebGPU round-trip is skipped for pass-through — the pixels go directly from
- * FFmpeg extraction to FFmpeg encoding. WebGPU is only needed when transforms
- * (scale, rotate, opacity from GSAP) must be applied to the HDR pixels.
- */
-export function convertHdrFrameToRgb48le(
-  rawRgba64le: Buffer,
-  width: number,
-  height: number,
-): Buffer {
-  const input = new Uint16Array(
-    rawRgba64le.buffer,
-    rawRgba64le.byteOffset,
-    rawRgba64le.byteLength / 2,
-  );
-
-  // Convert RGBA → RGB (drop alpha) for rgb48le output
-  const output = Buffer.alloc(width * height * 6);
-
-  for (let y = 0; y < height; y++) {
-    for (let x = 0; x < width; x++) {
-      const srcIdx = (y * width + x) * 4;
-      const dstIdx = (y * width + x) * 6;
-      output.writeUInt16LE(input[srcIdx] ?? 0, dstIdx);
-      output.writeUInt16LE(input[srcIdx + 1] ?? 0, dstIdx + 2);
-      output.writeUInt16LE(input[srcIdx + 2] ?? 0, dstIdx + 4);
-    }
-  }
-
-  return output;
-}
-
 // ── Frame upload + readback ───────────────────────────────────────────────────
 
 /**
diff --git a/packages/shader-transitions/src/webgl.ts b/packages/shader-transitions/src/webgl.ts
index a36ffe51f..1a2c3584e 100644
--- a/packages/shader-transitions/src/webgl.ts
+++ b/packages/shader-transitions/src/webgl.ts
@@ -147,16 +147,6 @@ export function createTexture(gl: WebGLRenderingContext): WebGLTexture {
   return tex;
 }
 
-export function uploadTexture(
-  gl: WebGLRenderingContext,
-  tex: WebGLTexture,
-  canvas: HTMLCanvasElement,
-): void {
-  uploadTextureSource(gl, tex, canvas);
-  canvas.width = 0;
-  canvas.height = 0;
-}
-
 export function uploadTextureSource(
   gl: WebGLRenderingContext,
   tex: WebGLTexture,
diff --git a/packages/studio/src/components/editor/TimelineLayerPanel.tsx b/packages/studio/src/components/editor/TimelineLayerPanel.tsx
index a87e2ee07..3a0447a0f 100644
--- a/packages/studio/src/components/editor/TimelineLayerPanel.tsx
+++ b/packages/studio/src/components/editor/TimelineLayerPanel.tsx
@@ -1,14 +1,5 @@
-import { memo } from "react";
 import type { DomEditLayerItem } from "./domEditing";
 
-interface TimelineLayerPanelProps {
-  clipLabel: string;
-  layers: DomEditLayerItem[];
-  selectedLayerKey: string | null;
-  onSelectLayer: (layer: DomEditLayerItem) => void;
-  onClose: () => void;
-}
-
 const MEDIA_LAYER_TAGS = new Set(["audio", "canvas", "img", "picture", "svg", "video"]);
 
 export function getTimelineLayerPanelSummary(layers: readonly DomEditLayerItem[]): string {
@@ -22,92 +13,3 @@ export function getTimelineLayerPanelSummary(layers: readonly DomEditLayerItem[]
     ? "Single selectable media layer"
     : "Single selectable layer";
 }
-
-export const TimelineLayerPanel = memo(function TimelineLayerPanel({
-  clipLabel,
-  layers,
-  selectedLayerKey,
-  onSelectLayer,
-  onClose,
-}: TimelineLayerPanelProps) {
-  return (
-    <div className="flex h-full min-h-0 flex-col overflow-hidden bg-neutral-950">
-      <div className="flex items-start justify-between gap-3 border-b border-white/10 px-3 py-3">
-        <div className="min-w-0">
-          <div className="text-[9px] font-semibold uppercase tracking-[0.18em] text-neutral-500">
-            Clip layers
-          </div>
-          <div className="mt-1 truncate text-sm font-semibold text-neutral-100">{clipLabel}</div>
-        </div>
-        <button
-          type="button"
-          onPointerDown={(event) => {
-            event.stopPropagation();
-          }}
-          onClick={onClose}
-          className="flex h-7 w-7 flex-shrink-0 items-center justify-center rounded-md border border-white/10 bg-black/20 text-neutral-500 transition-colors hover:border-white/20 hover:text-neutral-200"
-          aria-label="Close clip layers"
-        >
-          <svg
-            width="14"
-            height="14"
-            viewBox="0 0 24 24"
-            fill="none"
-            stroke="currentColor"
-            strokeWidth="1.8"
-            strokeLinecap="round"
-            aria-hidden="true"
-          >
-            <path d="M18 6 6 18" />
-            <path d="m6 6 12 12" />
-          </svg>
-        </button>
-      </div>
-      <div className="border-b border-white/10 px-3 py-2 text-[11px] text-neutral-500">
-        {getTimelineLayerPanelSummary(layers)}
-      </div>
-      <div className="min-h-0 flex-1 overflow-y-auto py-1">
-        {layers.map((layer) => {
-          const selected = layer.key === selectedLayerKey;
-          return (
-            <button
-              key={layer.key}
-              type="button"
-              data-timeline-layer-row={layer.key}
-              onPointerDown={(event) => {
-                event.stopPropagation();
-                onSelectLayer(layer);
-              }}
-              onClick={(event) => {
-                event.stopPropagation();
-                onSelectLayer(layer);
-              }}
-              className={`group flex w-full items-center gap-2 px-2.5 py-1.5 text-left transition-colors ${
-                selected
-                  ? "bg-studio-accent/14 text-studio-accent"
-                  : "text-neutral-300 hover:bg-white/[0.04] hover:text-neutral-100"
-              }`}
-              style={{ paddingLeft: 10 + layer.depth * 14 }}
-            >
-              <span
-                className={`flex h-5 w-5 flex-shrink-0 items-center justify-center rounded-md border text-[9px] font-bold uppercase ${
-                  selected
-                    ? "border-studio-accent/50 bg-studio-accent/18"
-                    : "border-white/10 bg-black/20 text-neutral-500 group-hover:text-neutral-300"
-                }`}
-              >
-                {layer.tagName.slice(0, 2)}
-              </span>
-              <span className="min-w-0 flex-1 truncate text-xs font-medium">{layer.label}</span>
-              {layer.childCount > 0 && (
-                <span className="rounded-full border border-white/10 bg-black/25 px-1.5 py-0.5 text-[9px] font-semibold tabular-nums text-neutral-500">
-                  {layer.childCount}
-                </span>
-              )}
-            </button>
-          );
-        })}
-      </div>
-    </div>
-  );
-});
diff --git a/packages/studio/src/components/editor/domEditingElement.ts b/packages/studio/src/components/editor/domEditingElement.ts
index 96d33ea12..4a339c859 100644
--- a/packages/studio/src/components/editor/domEditingElement.ts
+++ b/packages/studio/src/components/editor/domEditingElement.ts
@@ -12,9 +12,7 @@ import type {
 import {
   buildStableSelector,
   escapeCssString,
-  findClosestByAttribute,
   getElementDepth,
-  getPreferredClassSelector,
   getSelectorIndex,
   getSourceFileForElement,
   isHtmlElement,
@@ -60,7 +58,7 @@ function isEmptyVisualContainer(el: HTMLElement): boolean {
   return true;
 }
 
-export function hasRenderedBox(el: HTMLElement): boolean {
+function hasRenderedBox(el: HTMLElement): boolean {
   const rect = el.getBoundingClientRect();
   if (rect.width <= 1 || rect.height <= 1) return false;
   if (!isElementComputedVisible(el)) return false;
@@ -324,7 +322,3 @@ export function getDirectLayerChildren(
       isHtmlElement(child) && getDomLayerPatchTarget(child, options.activeCompositionPath) !== null,
   );
 }
-
-// ─── Composition source helpers ───────────────────────────────────────────────
-
-export { findClosestByAttribute, getPreferredClassSelector, getSourceFileForElement };
diff --git a/packages/studio/src/components/editor/manualEditingAvailability.test.ts b/packages/studio/src/components/editor/manualEditingAvailability.test.ts
index 7fde62f30..aa8968bb6 100644
--- a/packages/studio/src/components/editor/manualEditingAvailability.test.ts
+++ b/packages/studio/src/components/editor/manualEditingAvailability.test.ts
@@ -23,37 +23,15 @@ describe("manual editing availability", () => {
     expect(availability.STUDIO_PREVIEW_SELECTION_ENABLED).toBe(true);
     expect(availability.STUDIO_INSPECTOR_PANELS_ENABLED).toBe(true);
     expect(availability.STUDIO_MOTION_PANEL_ENABLED).toBe(false);
-    expect(availability.STUDIO_TIMELINE_LAYER_INSPECTOR_ENABLED).toBe(true);
   });
 
-  it("keeps explicit truthy inspector env flags enabled", async () => {
-    const availability = await loadAvailabilityWithEnv({
-      VITE_STUDIO_ENABLE_INSPECTOR_PANELS: "1",
-      VITE_STUDIO_ENABLE_TIMELINE_LAYER_INSPECTOR: "true",
-    });
-
-    expect(availability.STUDIO_INSPECTOR_PANELS_ENABLED).toBe(true);
-    expect(availability.STUDIO_TIMELINE_LAYER_INSPECTOR_ENABLED).toBe(true);
-  });
-
-  it("allows explicit env flags to disable default-on inspector layers", async () => {
-    const availability = await loadAvailabilityWithEnv({
-      VITE_STUDIO_ENABLE_TIMELINE_LAYER_INSPECTOR: "off",
-    });
-
-    expect(availability.STUDIO_INSPECTOR_PANELS_ENABLED).toBe(true);
-    expect(availability.STUDIO_TIMELINE_LAYER_INSPECTOR_ENABLED).toBe(false);
-  });
-
-  it("keeps timeline layer inspection off when the parent inspector flag is off", async () => {
+  it("disables preview selection when the inspector panel flag is explicitly off", async () => {
     const availability = await loadAvailabilityWithEnv({
       VITE_STUDIO_ENABLE_INSPECTOR_PANELS: "0",
-      VITE_STUDIO_ENABLE_TIMELINE_LAYER_INSPECTOR: "true",
     });
 
     expect(availability.STUDIO_INSPECTOR_PANELS_ENABLED).toBe(false);
     expect(availability.STUDIO_PREVIEW_SELECTION_ENABLED).toBe(false);
-    expect(availability.STUDIO_TIMELINE_LAYER_INSPECTOR_ENABLED).toBe(false);
   });
 
   it("enables feature flags with explicit truthy env values", () => {
diff --git a/packages/studio/src/components/editor/manualEditingAvailability.ts b/packages/studio/src/components/editor/manualEditingAvailability.ts
index 703211a13..bd3b59c5b 100644
--- a/packages/studio/src/components/editor/manualEditingAvailability.ts
+++ b/packages/studio/src/components/editor/manualEditingAvailability.ts
@@ -1,10 +1,8 @@
 export type StudioFeatureFlagEnv = Record<string, boolean | string | undefined>;
 
-export const STUDIO_PREVIEW_MANUAL_DRAGGING_ENV = "VITE_STUDIO_ENABLE_PREVIEW_MANUAL_DRAGGING";
-export const STUDIO_INSPECTOR_PANELS_ENV = "VITE_STUDIO_ENABLE_INSPECTOR_PANELS";
-export const STUDIO_MOTION_PANEL_ENV = "VITE_STUDIO_ENABLE_MOTION_PANEL";
-export const STUDIO_TIMELINE_LAYER_INSPECTOR_ENV = "VITE_STUDIO_ENABLE_TIMELINE_LAYER_INSPECTOR";
-
+const STUDIO_PREVIEW_MANUAL_DRAGGING_ENV = "VITE_STUDIO_ENABLE_PREVIEW_MANUAL_DRAGGING";
+const STUDIO_INSPECTOR_PANELS_ENV = "VITE_STUDIO_ENABLE_INSPECTOR_PANELS";
+const STUDIO_MOTION_PANEL_ENV = "VITE_STUDIO_ENABLE_MOTION_PANEL";
 const TRUTHY_ENV_VALUES = new Set(["1", "true", "yes", "on", "enabled"]);
 const FALSY_ENV_VALUES = new Set(["0", "false", "no", "off", "disabled"]);
 
@@ -52,14 +50,6 @@ export const STUDIO_MOTION_PANEL_ENABLED = resolveStudioBooleanEnvFlag(
   false,
 );
 
-export const STUDIO_TIMELINE_LAYER_INSPECTOR_ENABLED =
-  STUDIO_INSPECTOR_PANELS_ENABLED &&
-  resolveStudioBooleanEnvFlag(
-    env,
-    [STUDIO_TIMELINE_LAYER_INSPECTOR_ENV, "VITE_STUDIO_TIMELINE_LAYER_INSPECTOR_ENABLED"],
-    true,
-  );
-
 export const STUDIO_BLOCKS_PANEL_ENABLED = resolveStudioBooleanEnvFlag(
   env,
   ["VITE_STUDIO_ENABLE_BLOCKS_PANEL", "VITE_STUDIO_BLOCKS_PANEL_ENABLED"],
@@ -68,6 +58,4 @@ export const STUDIO_BLOCKS_PANEL_ENABLED = resolveStudioBooleanEnvFlag(
 
 export const STUDIO_PREVIEW_SELECTION_ENABLED = STUDIO_INSPECTOR_PANELS_ENABLED;
 
-export const STUDIO_MANUAL_EDITING_ENABLED = STUDIO_PREVIEW_MANUAL_EDITING_ENABLED;
-
 export const STUDIO_MANUAL_EDITING_DISABLED_TITLE = "Manual editing is temporarily disabled";
diff --git a/packages/studio/src/components/editor/manualEditsSnapshot.ts b/packages/studio/src/components/editor/manualEditsSnapshot.ts
index ea14f255d..1cf840ff5 100644
--- a/packages/studio/src/components/editor/manualEditsSnapshot.ts
+++ b/packages/studio/src/components/editor/manualEditsSnapshot.ts
@@ -11,7 +11,6 @@ import {
   STUDIO_HEIGHT_PROP,
   STUDIO_ROTATION_PROP,
   STUDIO_PATH_OFFSET_ATTR,
-  STUDIO_MANUAL_EDIT_GESTURE_ATTR,
   STUDIO_BOX_SIZE_ATTR,
   STUDIO_ROTATION_ATTR,
   STUDIO_ORIGINAL_TRANSLATE_ATTR,
@@ -33,7 +32,6 @@ import {
   STUDIO_ORIGINAL_INLINE_ROTATE_ATTR,
   STUDIO_ORIGINAL_ROTATION_TRANSFORM_ORIGIN_ATTR,
   STUDIO_ROTATION_DRAFT_ATTR,
-  STUDIO_ORIGINAL_TRANSFORM_DISPLAY_ATTR,
 } from "./manualEditsTypes";
 import type {
   StudioBoxSizeSnapshot,
@@ -187,38 +185,6 @@ export function restoreStudioPathOffset(
   );
 }
 
-/* ── DOM element collection ───────────────────────────────────────── */
-export function collectStudioManualEditElements(doc: Document): HTMLElement[] {
-  const htmlElement = doc.defaultView?.HTMLElement;
-  if (!htmlElement) return [];
-
-  const elements = [doc.documentElement, ...Array.from(doc.getElementsByTagName("*"))].filter(
-    (element): element is HTMLElement => element instanceof htmlElement,
-  );
-
-  return elements.filter(
-    (element) =>
-      element.hasAttribute(STUDIO_PATH_OFFSET_ATTR) ||
-      element.hasAttribute(STUDIO_MANUAL_EDIT_GESTURE_ATTR) ||
-      element.hasAttribute(STUDIO_BOX_SIZE_ATTR) ||
-      element.hasAttribute(STUDIO_ROTATION_ATTR) ||
-      element.hasAttribute(STUDIO_ROTATION_DRAFT_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_TRANSLATE_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_INLINE_TRANSLATE_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_TRANSFORM_DISPLAY_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_MIN_WIDTH_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_FLEX_BASIS_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_SCALE_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_ROTATE_ATTR) ||
-      element.hasAttribute(STUDIO_ORIGINAL_INLINE_ROTATE_ATTR) ||
-      Boolean(element.style.getPropertyValue(STUDIO_OFFSET_X_PROP)) ||
-      Boolean(element.style.getPropertyValue(STUDIO_OFFSET_Y_PROP)) ||
-      Boolean(element.style.getPropertyValue(STUDIO_WIDTH_PROP)) ||
-      Boolean(element.style.getPropertyValue(STUDIO_HEIGHT_PROP)) ||
-      Boolean(element.style.getPropertyValue(STUDIO_ROTATION_PROP)),
-  );
-}
-
 /* ── Clear functions ──────────────────────────────────────────────── */
 type BoxSizeProperty =
   | "width"
diff --git a/packages/studio/src/icons/SystemIcons.tsx b/packages/studio/src/icons/SystemIcons.tsx
index 5058fce5f..3a43f29fb 100644
--- a/packages/studio/src/icons/SystemIcons.tsx
+++ b/packages/studio/src/icons/SystemIcons.tsx
@@ -1,54 +1,18 @@
 import {
-  WarningCircle,
-  Warning,
-  ArrowLeft as PhArrowLeft,
   Check as PhCheck,
-  CheckCircle as PhCheckCircle,
-  Circle as PhCircle,
   Clock as PhClock,
-  Code as PhCode,
-  DownloadSimple,
-  Pencil as PhPencil,
-  ArrowSquareOut,
   Eye as PhEye,
-  EyeClosed,
-  File as PhFile,
-  FileCode as PhFileCode,
-  FileText as PhFileText,
   FilmStrip,
-  Heart as PhHeart,
-  Image as PhImage,
-  Info as PhInfo,
   Stack,
-  SpinnerGap,
-  ArrowsOut,
-  CornersOut,
-  ChatCircle,
   ChatCenteredText,
-  Cursor,
   ArrowsOutCardinal,
   MusicNote,
   Palette as PhPalette,
-  Paperclip as PhPaperclip,
-  Pause as PhPause,
-  Play as PhPlay,
   Plus as PhPlus,
-  MagnifyingGlass,
-  PaperPlaneRight,
-  SkipBack as PhSkipBack,
-  SkipForward as PhSkipForward,
   Square as PhSquare,
-  Trash,
   TextT,
-  UploadSimple,
-  User as PhUser,
-  UsersThree,
-  VideoCamera,
   X as PhX,
   Lightning,
-  MagnifyingGlassPlus,
-  MagnifyingGlassMinus,
-  Terminal as PhTerminal,
   CaretDown,
   CaretRight,
   ClipboardText,
@@ -69,60 +33,21 @@ const makeIcon = (Icon: PhosphorIcon) => {
 };
 
 // Lucide name → Phosphor equivalent
-export const AlertCircle = makeIcon(WarningCircle);
-export const AlertTriangle = makeIcon(Warning);
-export const ArrowLeft = makeIcon(PhArrowLeft);
 export const Check = makeIcon(PhCheck);
-export const CheckCircle = makeIcon(PhCheckCircle);
-/** CheckCircle2 in lucide is visually identical to CheckCircle */
-export const CheckCircle2 = makeIcon(PhCheckCircle);
-export const Circle = makeIcon(PhCircle);
 export const Clock = makeIcon(PhClock);
-export const Code = makeIcon(PhCode);
-export const Download = makeIcon(DownloadSimple);
-export const Edit2 = makeIcon(PhPencil);
-export const ExternalLink = makeIcon(ArrowSquareOut);
 export const Eye = makeIcon(PhEye);
-export const EyeOff = makeIcon(EyeClosed);
-export const File = makeIcon(PhFile);
-export const FileCode = makeIcon(PhFileCode);
-export const FileText = makeIcon(PhFileText);
 export const Film = makeIcon(FilmStrip);
-export const Heart = makeIcon(PhHeart);
-export const Image = makeIcon(PhImage);
-export const Info = makeIcon(PhInfo);
 export const Layers = makeIcon(Stack);
-export const Loader2 = makeIcon(SpinnerGap);
-export const Maximize = makeIcon(ArrowsOut);
-export const Maximize2 = makeIcon(CornersOut);
-export const MessageCircle = makeIcon(ChatCircle);
 export const MessageSquare = makeIcon(ChatCenteredText);
-export const MousePointer = makeIcon(Cursor);
 export const Move = makeIcon(ArrowsOutCardinal);
 export const Music = makeIcon(MusicNote);
 export const Palette = makeIcon(PhPalette);
-export const Paperclip = makeIcon(PhPaperclip);
-export const Pause = makeIcon(PhPause);
-export const Pencil = makeIcon(PhPencil);
-export const Play = makeIcon(PhPlay);
 export const Plus = makeIcon(PhPlus);
-export const Search = makeIcon(MagnifyingGlass);
-export const Send = makeIcon(PaperPlaneRight);
-export const SkipBack = makeIcon(PhSkipBack);
-export const SkipForward = makeIcon(PhSkipForward);
 export const Square = makeIcon(PhSquare);
-export const Trash2 = makeIcon(Trash);
 export const Type = makeIcon(TextT);
-export const Upload = makeIcon(UploadSimple);
-export const User = makeIcon(PhUser);
-export const Users = makeIcon(UsersThree);
-export const Video = makeIcon(VideoCamera);
 export const X = makeIcon(PhX);
 export const Zap = makeIcon(Lightning);
-export const ZoomIn = makeIcon(MagnifyingGlassPlus);
-export const ZoomOut = makeIcon(MagnifyingGlassMinus);
 // Extra icons used in this project (not in lucide's default mapping above)
-export const Terminal = makeIcon(PhTerminal);
 export const ChevronDown = makeIcon(CaretDown);
 export const ChevronRight = makeIcon(CaretRight);
 export const ClipboardList = makeIcon(ClipboardText);
diff --git a/packages/studio/src/player/components/useTimelineRangeSelection.ts b/packages/studio/src/player/components/useTimelineRangeSelection.ts
index 6bfc2a555..6183057e7 100644
--- a/packages/studio/src/player/components/useTimelineRangeSelection.ts
+++ b/packages/studio/src/player/components/useTimelineRangeSelection.ts
@@ -144,19 +144,3 @@ export function useTimelineRangeSelection({
     handlePointerUp,
   };
 }
-
-/* ── Seek + scroll utilities (used in Timeline only) ──────────────── */
-export function seekTimeFromScrollX(
-  scrollEl: HTMLDivElement,
-  clientX: number,
-  effectiveDuration: number,
-  pps: number,
-  onSeek?: (time: number) => void,
-): void {
-  const rect = scrollEl.getBoundingClientRect();
-  const x = clientX - rect.left + scrollEl.scrollLeft - GUTTER;
-  if (x < 0) return;
-  const time = Math.max(0, Math.min(effectiveDuration, x / pps));
-  liveTime.notify(time);
-  onSeek?.(time);
-}
diff --git a/packages/studio/src/player/hooks/useTimelineSyncCallbacks.ts b/packages/studio/src/player/hooks/useTimelineSyncCallbacks.ts
index 54c28732f..06dd91221 100644
--- a/packages/studio/src/player/hooks/useTimelineSyncCallbacks.ts
+++ b/packages/studio/src/player/hooks/useTimelineSyncCallbacks.ts
@@ -18,7 +18,6 @@ import {
   findTimelineDomNodeForClip,
   createImplicitTimelineLayersFromDOM,
   buildStandaloneRootTimelineElement,
-  mergeTimelineElementsPreservingDowngrades,
   getTimelineElementSelector,
 } from "../lib/timelineDOM";
 import {
@@ -26,7 +25,6 @@ import {
   autoHealMissingCompositionIds,
   buildMissingCompositionElements,
 } from "../lib/timelineIframeHelpers";
-import { getTimelineElementIdentity } from "../lib/timelineElementHelpers";
 
 interface UseTimelineSyncCallbacksParams {
   iframeRef: React.RefObject<HTMLIFrameElement | null>;
@@ -288,7 +286,3 @@ export function useTimelineSyncCallbacks({
     onIframeLoad,
   };
 }
-
-// Re-export the merge helper so the hook can use it via this module (avoids
-// adding another import line to the already-large useTimelinePlayer.ts).
-export { mergeTimelineElementsPreservingDowngrades, getTimelineElementIdentity };
diff --git a/packages/studio/src/utils/studioHelpers.ts b/packages/studio/src/utils/studioHelpers.ts
index 3790dee6f..b193364c4 100644
--- a/packages/studio/src/utils/studioHelpers.ts
+++ b/packages/studio/src/utils/studioHelpers.ts
@@ -23,13 +23,7 @@ export function getTimelineElementLabel(element: TimelineElement): string {
   return element.label || element.id || element.tag;
 }
 
-export function confirmElementDelete(label: string, kind: "timeline clip" | "element"): boolean {
-  return window.confirm(
-    `Delete ${kind} "${label}"?\n\nThis removes it from the project source. You can use Undo to restore it.`,
-  );
-}
-
-export function normalizeProjectAssetPath(value: string): string {
+function normalizeProjectAssetPath(value: string): string {
   const trimmed = value.trim();
   const maybeUrl = /^[a-z]+:\/\//i.test(trimmed) ? new URL(trimmed).pathname : trimmed;
   return decodeURIComponent(maybeUrl)
@@ -51,7 +45,7 @@ export function toRelativeProjectAssetPath(sourceFile: string, assetPath: string
   return [...fromParts.map(() => ".."), ...targetParts].join("/") || assetPath;
 }
 
-export function isAbsoluteFilePath(value: string): boolean {
+function isAbsoluteFilePath(value: string): boolean {
   return /^(?:\/|[A-Za-z]:[\\/]|\\\\)/.test(value);
 }
 
@@ -181,7 +175,7 @@ export function collectHtmlIds(source: string): string[] {
   return Array.from(source.matchAll(/\bid="([^"]+)"/g), (match) => match[1] ?? "");
 }
 
-export const DEFAULT_TIMELINE_ASSET_DURATION: Record<TimelineAssetKind, number> = {
+const DEFAULT_TIMELINE_ASSET_DURATION: Record<TimelineAssetKind, number> = {
   image: 3,
   video: 5,
   audio: 5,
diff --git a/packages/studio/src/utils/timelineDiscovery.ts b/packages/studio/src/utils/timelineDiscovery.ts
index b449a4f1e..f4027953e 100644
--- a/packages/studio/src/utils/timelineDiscovery.ts
+++ b/packages/studio/src/utils/timelineDiscovery.ts
@@ -1,6 +1,4 @@
 export const TIMELINE_TOGGLE_SHORTCUT_LABEL = "Shift+T";
-const TIMELINE_EDITOR_HINT_STORAGE_KEY = "hf-studio-timeline-editor-hint-dismissed";
-
 type TimelineToggleHotkeyEvent = Pick<
   KeyboardEvent,
   "key" | "shiftKey" | "metaKey" | "ctrlKey" | "altKey" | "target"
@@ -41,17 +39,3 @@ export function shouldHandleTimelineToggleHotkey(event: TimelineToggleHotkeyEven
 export function getTimelineToggleTitle(timelineVisible: boolean): string {
   return `${timelineVisible ? "Hide" : "Show"} timeline editor (${TIMELINE_TOGGLE_SHORTCUT_LABEL})`;
 }
-
-export function getTimelineEditorHintDismissed(): boolean {
-  if (typeof window === "undefined") return false;
-  return window.localStorage.getItem(TIMELINE_EDITOR_HINT_STORAGE_KEY) === "1";
-}
-
-export function setTimelineEditorHintDismissed(dismissed: boolean): void {
-  if (typeof window === "undefined") return;
-  if (dismissed) {
-    window.localStorage.setItem(TIMELINE_EDITOR_HINT_STORAGE_KEY, "1");
-    return;
-  }
-  window.localStorage.removeItem(TIMELINE_EDITOR_HINT_STORAGE_KEY);
-}