Rework WebGL book playback to single ownership and fix flip/reveal pipeline

Establish book-playback-timeline as the sole playback owner driving the
scene through formal webgl-book:* events (not the BookLabDebug surface),
with a single reveal clock in the scene render loop and webgl-page-cache as
the only texture cache. Remove the legacy dual playback path and the
ownsPageFlipCommit gating.

Fixes:
- Flip page detached/folded at the spine: restore the raw page-cap line for
  flip geometry (matches the prototype/pre-regression), removing
  normalizeFlipLineToVisiblePage which moved the pivot off the spine arc.
- Flip textures: distance-based UVs (no horizontal compression),
  direction-aware face material (source on the camera-facing side), source
  meta derived from the visible spread (manual flips), prewarm shape fix.
- Reveal: flash removed on the static page and the flip back surface;
  spanning blocks rebuild the reveal plan at activate and continue the
  reveal on the next spread after the fill flip.
- Cache staleness is contentVersion-primary; nav clamps to spreadCount.

Docs updated to describe the intended single-owner architecture. Regression
checks updated to match.

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

public/js/game-loop-module.js

@@ -526,9 +526,7 @@ class GameLoopModule extends BaseModule {
     }
 
     getWebGLBookState() {
-        return window.WebGLBookPreferenceBridge?.getBookState?.()
-            || window.BookLabDebug?.getBookState?.()
-            || null;
+        return window.WebGLBookPreferenceBridge?.getBookState?.() || null;
     }
 
     applyWebGLBookState(state = null) {