refactor(core): simplify packages/core — dead code, dedup, type safety (#1413)

- Delete unused mediaPreloader module, 5 dead RuntimeState fields,
  emitPerformanceMetric, lintScriptUrls, 5 variable type guards
- Consolidate compiler utilities: unify CSS URL regex, relative URL
  predicate, MIME map, @import regex, bulk asset rewrite delegation
- Cache extractGsapWindows per script (eliminates 2 redundant recast
  parses per lint run), share stripJsComments and script extraction
- Deduplicate GSAP parser: share serializeValue/safeJsKey, centralize
  converted-id fallback (6 sites), keyframe codegen (3 sites),
  waypoint extraction, insert-after-anchor, script hoisting
- Replace 88 bare any annotations with typed AstNode/AstPath interfaces
- Derive RuntimeBridgeControlAction from HyperframeControlAction,
  alias RuntimePickerElementInfo, share macOS font profiler
- Gate generateHyperframesStyles on includeStyles, collapse 4 GSAP
  property mutation cases into 2
- Extract magic numbers into named constants, replace 5 double casts
  with type guards and typed accessors (runtime/globals.ts),
  reduce function complexity in htmlParser and files route

packages/core/src/runtime/state.ts

@@ -5,10 +5,8 @@ import type { TransportClock } from "./clock";
 export type RuntimeState = {
   capturedTimeline: RuntimeTimelineLike | null;
   isPlaying: boolean;
-  rafId: number | null;
   currentTime: number;
   deterministicAdapters: RuntimeDeterministicAdapter[];
-  parityModeEnabled: boolean;
   canonicalFps: number;
   bridgeMuted: boolean;
   bridgeVolume: number;
@@ -62,9 +60,7 @@ export type RuntimeState = {
    */
   bridgeMaxPostIntervalMs: number;
   controlBridgeHandler: ((event: MessageEvent) => void) | null;
-  clampDurationLoggedRaw: number | null;
   beforeUnloadHandler: (() => void) | null;
-  domReadyHandler: (() => void) | null;
   injectedCompStyles: HTMLStyleElement[];
   injectedCompScripts: HTMLScriptElement[];
   cachedTimedMediaEls: Array<HTMLVideoElement | HTMLAudioElement>;
@@ -72,7 +68,6 @@ export type RuntimeState = {
   cachedVideoClips: RuntimeMediaClip[];
   cachedMediaTimelineDurationSeconds: number;
   tornDown: boolean;
-  nativeVisualWatchdogTick: number;
   /**
    * Single-clock transport. The sole time authority — GSAP is always
    * paused and seeked to `clock.now()` on each rAF tick. Eliminates
@@ -87,10 +82,8 @@ export function createRuntimeState(): RuntimeState {
   return {
     capturedTimeline: null,
     isPlaying: false,
-    rafId: null,
     currentTime: 0,
     deterministicAdapters: [],
-    parityModeEnabled: true,
     canonicalFps: 30,
     bridgeMuted: false,
     bridgeVolume: 1,
@@ -104,9 +97,7 @@ export function createRuntimeState(): RuntimeState {
     bridgeLastPostedMuted: false,
     bridgeMaxPostIntervalMs: 80,
     controlBridgeHandler: null,
-    clampDurationLoggedRaw: null,
     beforeUnloadHandler: null,
-    domReadyHandler: null,
     injectedCompStyles: [],
     injectedCompScripts: [],
     cachedTimedMediaEls: [],
@@ -114,7 +105,6 @@ export function createRuntimeState(): RuntimeState {
     cachedVideoClips: [],
     cachedMediaTimelineDurationSeconds: 0,
     tornDown: false,
-    nativeVisualWatchdogTick: 0,
     transportClock: null,
     transportRafId: null,
   };