Smooth Wake toggle — Added to the popup UI + wired into popup.js DEFAULTS (was missing entirely, so the setting was invisible to users)

Stale texture mitigation — Three-pronged approach:
- Periodic background refresh — re-captures every 2s on static pages, every 500ms when <video> elements are playing. Uses "quick mode" that skips the
hide/show cycle so there's no flicker
- Faster scroll updates — Scroll debounce cut from 150ms to 80ms, plus scrollend event fires an immediate capture
- JPEG capture — Switched from PNG to JPEG quality 85 for the captureVisibleTab call. The data URL is much smaller, meaning faster transfer through the
message pipeline and faster blob→ImageBitmap conversion

v2.0.0 — Iridescent Wake Trails
- Replaced chromatic aberration with birefringence-inspired iridescence (colored fringe at contact edges)
- Added bright halo ring at contact edge
- Speed-dependent trail width
- Hold-then-snap release behavior (trail holds briefly, then vanishes all at once)
- Catmull-Rom spline subdivision for smoother trails
- Trail count doubled (32 → 64) for higher resolution
- Frame-rate-independent velocity smoothing
- Performance: eliminated redundant trail pass, single texture sample