refactor: extract command-palette helpers and dethunk ContentView.body (CV1, CV2) (#65)

CV1 — ContentView was a single 7000-line struct with ~4,000 lines of
command-palette orchestration written as private funcs mutating @State
directly. Moves 52 pure/computation functions (fuzzy-search corpus
building, result fingerprinting/diffing, shortcut resolution, switcher
entry construction, context-snapshot building — none of which touch
@State) into a new extension file, Sources/ContentView+CommandPalette.swift.

This is the conservative extraction: SwiftUI's @State can't be split
across files, so the @State/@ObservedObject properties, the view body,
and the @State-mutating activation-dispatch / rename / edit-description
flow orchestration all remain on ContentView in ContentView.swift. 19
members the moved functions touch (10 nested command-palette model
types, 6 small helper funcs, 3 computed properties) were widened from
private to internal so the extension can see them; behavior is
unchanged. Full controller-based extraction of the @State-owning
orchestration is a follow-up.

CV2 — ContentView.body reassigned a local through 15+
AnyView(view.onReceive(...)) steps to work around Swift's type checker
(each step needed a stable erased type to reassign into a var). Splits
the ~30 onChange/onReceive attachments into 9 ViewBuilder-composed
helper functions chained via a small number of local let bindings,
removing all AnyView type erasure from the body while keeping every
closure body byte-for-byte identical.

The body's window-accessor closure also mutated AppKit window state
(identifier, titlebar, movability, transparency, glass effect, window
decorations) directly from the view layer. Moves that logic into a new
AppDelegate.configureMainWindow(...) method; the view now makes one
call and keeps only the @State bookkeeping (observedWindow,
isFullScreen, titlebarPadding) it actually owns. makeViewHierarchyTransparent
became a static func on ContentView since it never touched instance state.

project.pbxproj: registers ContentView+CommandPalette.swift (file
reference + build file, mirroring ContentView.swift's 4 entries).

Author: arzafran

GhosttyTabs.xcodeproj/project.pbxproj

@@ -10,6 +10,7 @@
 			A5001001 /* ProgramaApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5001011 /* ProgramaApp.swift */; };
 			A5FF0007 /* SettingDefinition.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5FF0017 /* SettingDefinition.swift */; };
 			A5001002 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5001012 /* ContentView.swift */; };
+			A5FF0005 /* ContentView+CommandPalette.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5FF0015 /* ContentView+CommandPalette.swift */; };
 			E62155868BB29FEB5DAAAF25 /* SidebarSelectionState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9AD52285508B1D6A9875E7B3 /* SidebarSelectionState.swift */; };
 			B9000018A1B2C3D4E5F60719 /* WindowDragHandleView.swift in Sources */ = {isa = PBXBuildFile; fileRef = B9000017A1B2C3D4E5F60719 /* WindowDragHandleView.swift */; };
 			A5001003 /* TabManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = A5001013 /* TabManager.swift */; };
@@ -225,6 +226,7 @@
 			A5001011 /* ProgramaApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProgramaApp.swift; sourceTree = "<group>"; };
 			A5FF0017 /* SettingDefinition.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingDefinition.swift; sourceTree = "<group>"; };
 			A5001012 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
+			A5FF0015 /* ContentView+CommandPalette.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "ContentView+CommandPalette.swift"; sourceTree = "<group>"; };
 			9AD52285508B1D6A9875E7B3 /* SidebarSelectionState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SidebarSelectionState.swift; sourceTree = "<group>"; };
 			B9000017A1B2C3D4E5F60719 /* WindowDragHandleView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WindowDragHandleView.swift; sourceTree = "<group>"; };
 			A5001013 /* TabManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TabManager.swift; sourceTree = "<group>"; };
@@ -487,6 +489,7 @@
 					A5001011 /* ProgramaApp.swift */,
 					A5FF0017 /* SettingDefinition.swift */,
 					A5001012 /* ContentView.swift */,
+					A5FF0015 /* ContentView+CommandPalette.swift */,
 					9AD52285508B1D6A9875E7B3 /* SidebarSelectionState.swift */,
 					B9000017A1B2C3D4E5F60719 /* WindowDragHandleView.swift */,
 					A50012F0 /* Backport.swift */,
@@ -808,6 +811,7 @@
 					A5001001 /* ProgramaApp.swift in Sources */,
 					A5FF0007 /* SettingDefinition.swift in Sources */,
 					A5001002 /* ContentView.swift in Sources */,
+					A5FF0005 /* ContentView+CommandPalette.swift in Sources */,
 					E62155868BB29FEB5DAAAF25 /* SidebarSelectionState.swift in Sources */,
 					B9000018A1B2C3D4E5F60719 /* WindowDragHandleView.swift in Sources */,
 					A50012F1 /* Backport.swift in Sources */,

Sources/AppDelegate.swift

@@ -10392,6 +10392,97 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
     }
 #endif
 
+    /// Configures a Programa main window's AppKit-level presentation (identifier,
+    /// titlebar, movability, transparency, glass effect, decorations) and registers
+    /// it for window-context tracking, then installs the file-drop overlay.
+    ///
+    /// Extracted verbatim from `ContentView`'s `WindowAccessor` trailing closure
+    /// (nuclear-review CV2b) so this AppKit window mutation lives with the
+    /// window-context layer instead of the SwiftUI view layer. `ContentView` still
+    /// owns tracking its own `@State` (`observedWindow`, `isFullScreen`,
+    /// `titlebarPadding`) — this method returns the computed titlebar padding so
+    /// the caller can decide whether to update that `@State`.
+    @discardableResult
+    func configureMainWindow(
+        _ window: NSWindow,
+        windowId: UUID,
+        windowIdentifier: String,
+        tabManager: TabManager,
+        sidebarState: SidebarState,
+        sidebarSelectionState: SidebarSelectionState,
+        sidebarBlendMode: String,
+        bgGlassEnabled: Bool,
+        bgGlassTintHex: String,
+        bgGlassTintOpacity: Double
+    ) -> CGFloat {
+        window.identifier = NSUserInterfaceItemIdentifier(windowIdentifier)
+        window.titlebarAppearsTransparent = true
+        // Keep window immovable; the sidebar's WindowDragHandleView handles
+        // drag-to-move via performDrag with temporary movable override.
+        // isMovableByWindowBackground=true breaks tab reordering, and
+        // isMovable=true blocks clicks on sidebar buttons in minimal mode.
+        window.isMovableByWindowBackground = false
+        window.isMovable = false
+        window.styleMask.insert(.fullSizeContentView)
+
+        // Keep content below the titlebar so drags on Bonsplit's tab bar don't
+        // get interpreted as window drags.
+        let computedTitlebarHeight = window.frame.height - window.contentLayoutRect.height
+        let nextTitlebarPadding = max(28, min(72, computedTitlebarHeight))
+#if DEBUG
+        if ProcessInfo.processInfo.environment["PROGRAMA_UI_TEST_MODE"] == "1" {
+            UpdateLogStore.shared.append("ui test window accessor: id=\(windowIdentifier) visible=\(window.isVisible)")
+        }
+#endif
+        // User settings decide whether window glass is active. The native Tahoe
+        // NSGlassEffectView path vs the older NSVisualEffectView fallback is chosen
+        // inside WindowGlassEffect.apply.
+        let currentThemeBackground = GhosttyBackgroundTheme.currentColor()
+        let shouldApplyWindowGlass = cmuxShouldApplyWindowGlass(
+            sidebarBlendMode: sidebarBlendMode,
+            bgGlassEnabled: bgGlassEnabled,
+            glassEffectAvailable: WindowGlassEffect.isAvailable
+        )
+        let shouldForceTransparentHosting =
+            shouldApplyWindowGlass || currentThemeBackground.alphaComponent < 0.999
+
+        if shouldForceTransparentHosting {
+            window.isOpaque = false
+            // Keep the window clear whenever translucency is active. Relying only on
+            // terminal focus-driven updates can leave stale opaque window fills.
+            window.backgroundColor = NSColor.white.withAlphaComponent(0.001)
+            // Configure contentView hierarchy for transparency.
+            if let contentView = window.contentView {
+                ContentView.makeViewHierarchyTransparent(contentView)
+            }
+        } else {
+            // Browser-focused workspaces may not have an active terminal panel to refresh
+            // the NSWindow background. Keep opaque theme changes applied here as well.
+            window.backgroundColor = currentThemeBackground
+            window.isOpaque = currentThemeBackground.alphaComponent >= 0.999
+        }
+
+        if shouldApplyWindowGlass {
+            // Apply liquid glass effect to the window with tint from settings
+            let tintColor = (NSColor(hex: bgGlassTintHex) ?? .black).withAlphaComponent(bgGlassTintOpacity)
+            WindowGlassEffect.apply(to: window, tintColor: tintColor)
+        } else {
+            WindowGlassEffect.remove(from: window)
+        }
+        AppDelegate.shared?.attachUpdateAccessory(to: window)
+        AppDelegate.shared?.applyWindowDecorations(to: window)
+        AppDelegate.shared?.registerMainWindow(
+            window,
+            windowId: windowId,
+            tabManager: tabManager,
+            sidebarState: sidebarState,
+            sidebarSelectionState: sidebarSelectionState
+        )
+        installFileDropOverlay(on: window, tabManager: tabManager)
+
+        return nextTitlebarPadding
+    }
+
 }
 
 @MainActor