refactor: remove legacy manual edits JSON manifest render script

Remove the old `.hyperframes/studio-manual-edits.json` sidecar approach
that injected a manifest-based runtime into rendered HTML to apply
position/rotation/size edits. This was replaced by the seek-reapply
script that reads positions directly from HTML data attributes and CSS
custom properties (shipped in v0.6.7).

Removed: `createStudioManualEditsRenderBodyScript`,
`studioManualEditsRenderRuntime`, `STUDIO_MANUAL_EDITS_PATH`, and all
references in CLI server, studio vite plugins, and thumbnail routes.

Kept: `createStudioPositionSeekReapplyScript` (active render script),
all motion panel code, all manual edits DOM code.

Author: miguel-heygen

packages/cli/src/server/studioServer.ts

@@ -13,7 +13,6 @@ import { createProjectWatcher, type ProjectWatcher } from "./fileWatcher.js";
 import { loadRuntimeSource } from "./runtimeSource.js";
 import { VERSION as version } from "../version.js";
 import {
-  createStudioManualEditsRenderBodyScript,
   createStudioApi,
   createProjectSignature,
   getMimeType,
@@ -24,8 +23,6 @@ import {
 import { getElementScreenshotClip } from "@hyperframes/core/studio-api/screenshot-clip";
 import type { ScreenshotClip } from "@hyperframes/core/studio-api/screenshot-clip";
 
-const STUDIO_MANUAL_EDITS_PATH = ".hyperframes/studio-manual-edits.json";
-
 // ── Path resolution ─────────────────────────────────────────────────────────
 
 function resolveDistDir(): string {
@@ -81,38 +78,6 @@ function resolveRuntimePath(): string {
   return builtPath;
 }
 
-function readStudioManualEditManifestContent(projectDir: string): string {
-  const manifestPath = join(projectDir, STUDIO_MANUAL_EDITS_PATH);
-  if (!existsSync(manifestPath)) return "";
-  try {
-    return readFileSync(manifestPath, "utf-8");
-  } catch {
-    return "";
-  }
-}
-
-async function applyStudioManualEditsToThumbnailPage(
-  page: import("puppeteer-core").Page,
-  manifestContent: string,
-  activeCompositionPath: string,
-): Promise<void> {
-  const script = createStudioManualEditsRenderBodyScript(manifestContent, {
-    activeCompositionPath,
-  });
-  if (!script) return;
-  await page.addScriptTag({ content: script });
-}
-
-async function reapplyStudioManualEditsToThumbnailPage(
-  page: import("puppeteer-core").Page,
-): Promise<void> {
-  await page.evaluate(() => {
-    const apply = (window as Window & { __hfStudioManualEditsApply?: () => number })
-      .__hfStudioManualEditsApply;
-    if (typeof apply === "function") apply();
-  });
-}
-
 // ── Shared thumbnail browser (singleton per process) ────────────────────────
 // One browser instance is reused across all composition thumbnail requests.
 // Spawning a new Puppeteer process per request adds 2-5s overhead and causes
@@ -253,16 +218,13 @@ export function createStudioServer(options: StudioServerOptions): StudioServer {
             // Continue without — acquireBrowser will try its own resolution
           }
 
-          const manifestContent = readStudioManualEditManifestContent(opts.project.dir);
-          const manualEditsRenderScript = createStudioManualEditsRenderBodyScript(manifestContent);
           const job = createRenderJob({
             // opts.fps is already an Fps rational — see vite-config-studio
             // adapter for the same convention.
             fps: opts.fps,
             quality: opts.quality as "draft" | "standard" | "high",
             format: opts.format,
             outputResolution: opts.outputResolution,
-            ...(manualEditsRenderScript ? { renderBodyScripts: [manualEditsRenderScript] } : {}),
           });
           const startTime = Date.now();
           const onProgress = (j: { progress: number; currentStage?: string }) => {
@@ -319,11 +281,8 @@ export function createStudioServer(options: StudioServerOptions): StudioServer {
             win.__timeline.seek(t);
           }
         }, opts.seekTime);
-        const manifestContent = readStudioManualEditManifestContent(opts.project.dir);
-        await applyStudioManualEditsToThumbnailPage(page, manifestContent, opts.compPath);
         // Let the seek render settle.
         await new Promise((r) => setTimeout(r, 200));
-        await reapplyStudioManualEditsToThumbnailPage(page);
         let clip: ScreenshotClip | undefined;
         if (opts.selector) {
           clip = await page.evaluate(getElementScreenshotClip, opts.selector, opts.selectorIndex);