feat: replace Remotion with custom Bradly Engine (Phases 1-3)

- Phase 1: Custom animation engine (interpolate, spring, Easing)
- Phase 2: Custom composition components (AbsoluteFill, Sequence, Img, Video, Audio)
- Phase 3: BradlyPlayer with rAF frame loop, imperative API, controls

Migrated 24 files from remotion/@remotion/player imports to src/engine/.
All type errors from migration resolved. Pre-existing errors remain unchanged.

src/components/shared/LivePreviewCanvas.tsx

@@ -1,6 +1,6 @@
 import React, { useMemo, useState, useCallback, useRef, useEffect } from 'react';
 import { Play, Pause, RotateCcw, Film } from 'lucide-react';
-import { Player, PlayerRef } from '@remotion/player';
+import { BradlyPlayer, BradlyPlayerRef } from '../../engine/player';
 import { ExpressTemplate, CompanyProfile, DesignMD } from '../../types';
 import { BrandComposition } from '../BrandComposition';
 import { compileExpressToTimeline, getAspectDimensions, getTemplateDuration } from '../../utils/expressCompiler';
@@ -31,7 +31,7 @@ export interface LivePreviewCanvasProps {
   /** Callback when user navigates to a scene */
   onSceneChange?: (sceneId: string) => void;
   /** External player ref */
-  playerRef?: React.RefObject<PlayerRef>;
+  playerRef?: React.RefObject<BradlyPlayerRef>;
   /** Status label (e.g. "Listo" / "Faltan campos") */
   statusLabel?: string;
   /** Whether all required fields are complete */
@@ -67,7 +67,7 @@ export const LivePreviewCanvas: React.FC<LivePreviewCanvasProps> = ({
   statusLabel,
   isComplete = false,
 }) => {
-  const internalRef = useRef<PlayerRef>(null);
+  const internalRef = useRef<BradlyPlayerRef>(null);
   const playerRef = externalRef || internalRef;
 
   const [isPlaying, setIsPlaying] = useState(false);
@@ -246,7 +246,7 @@ export const LivePreviewCanvas: React.FC<LivePreviewCanvasProps> = ({
           maxHeight: 'calc(100% - 160px)',
         }}
       >
-        <Player
+        <BradlyPlayer
           key={playerKey}
           ref={playerRef}
           component={BrandComposition}