Reels: ease burst fade 0.08s → 0.12s

0.08s read as too abrupt; 0.12s keeps the burst clearly snappier than the
0.35s held-shot fade without jarring. Bumps RENDER_VERSION.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/reels/mod.rs

@@ -207,7 +207,7 @@ fn finish_job(
 
 /// Render version: bump to invalidate every cached reel after a rendering /
 /// scripting change that should produce a fresh result.
-const RENDER_VERSION: u32 = 5;
+const RENDER_VERSION: u32 = 6;
 
 /// Narration expressiveness — Chatterbox's `exaggeration` knob. A slight bump
 /// over the ~0.5 default warms up otherwise-flat narration without over-acting;