feat(studio): phone editing for Video Studio + Image Editor (remove desktop gate)

Replaces the "desktop only" gate on phones with real mobile editing layouts.

Shared:
- BottomSheet (mobile slide-up panel) hosting the desktop side-docks on phones.
- Side panels made width-fluid (w-full on mobile, fixed on md+): StudioSidebarContent,
  ImageEditorRightPanel.

Video Studio (VideoStudioMobileLayout):
- Canvas fills the viewport; the vertical tool dock becomes a scrollable bottom bar;
  each tool's panel + the timeline open as bottom sheets. Exported MAIN_DOCK_ITEMS.

Image Editor (ImageEditorMobileLayout):
- Canvas fills the viewport; toolbar → scrollable bottom bar; Adjust/Filters/Layers
  panel + shape picker open as bottom sheets. Exported IMAGE_TOOLS/IMAGE_SHAPES.
- Touch editing: Stage now handles onTouchStart/Move/End (draw, select, move) with
  touch-action:none; draw-tool stroke works with a finger. Pointer handlers widened
  to MouseEvent | TouchEvent.

i18n: added timeline/preview/panels keys (fa+en, parity verified). Full next build +
tsc clean. (Studio is auth-gated — verify editing on a device.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

messages/en.json

@@ -914,6 +914,7 @@
       "toolShape": "Shape",
       "toolDraw": "Draw",
       "toolAi": "AI",
+      "panels": "Adjust",
       "shapeRectangle": "Rectangle",
       "shapeCircle": "Circle",
       "shapeLine": "Line",
@@ -1223,6 +1224,8 @@
       "transitions": "Transitions",
       "font": "Font",
       "myWatermark": "My Watermark",
+      "timeline": "Timeline",
+      "preview": "Preview",
       "toolsNavLabel": "Studio tools",
       "guideMe": "Guide me",
       "guideComingSoon": "👋 Guide coming soon!",

messages/fa.json

@@ -914,6 +914,7 @@
       "toolShape": "شکل",
       "toolDraw": "ترسیم",
       "toolAi": "هوش مصنوعی",
+      "panels": "تنظیمات",
       "shapeRectangle": "مستطیل",
       "shapeCircle": "دایره",
       "shapeLine": "خط",
@@ -1223,6 +1224,8 @@
       "transitions": "گذارها",
       "font": "فونت",
       "myWatermark": "واترمارک من",
+      "timeline": "خط زمان",
+      "preview": "پیش‌نمایش",
       "toolsNavLabel": "ابزارهای استودیو",
       "guideMe": "راهنمایی‌ام کن",
       "guideComingSoon": "👋 راهنما به‌زودی ارائه می‌شود!",