v1.2.1 — Site compatibility overhaul

NEW FEATURES:
- Three views: Side, Below, and a new draggable Floating view
- Direct view selection from the popup (Side / Below / Float buttons)
- The extension now auto-picks the best view based on the page layout
- Float view is always guaranteed to work — it attaches to the page body so it works on any site

BUG FIXES — better site compatibility:
- Smarter video detection: skips hidden, zero-sized, or unplayable video elements (no more confusion on thumbnail pages)
- Smarter insertion logic: uses both width-growth and height-growth detection to find where the player wrapper ends and page content begins
- Handles sites with absolute-positioned wrappers (where the old logic would silently fail)
- Handles full-width single-column video layouts
- No more grid being inserted inside the player area on certain sites

OTHER:
- Removed per-domain view memory — every page starts fresh in auto-pick mode
- Replaced innerHTML usage with safer DOM APIs (createElementNS, removeChild)

v1.1.0 - Major update

New features:
- Click-to-toggle popup with interval picker, generate button, and shortcut display
- Auto-trigger on enable: page reloads and the grid generates automatically
- Automatic grid regeneration when a new video starts playing (SPA navigation, autoplay next, reload)
- Customizable keyboard shortcut (default Alt+G)
- Two view modes: side view (next to the video) and below view (3-column grid under the video), per-domain memory
- Cached frames across view switches

Bug fixes:
- Side view properly sized to match video height with scrollable frame list
- Fixed "frames captured but not shown" bug after Ctrl+R or new video
- More accurate frame capture using requestVideoFrameCallback and duplicate detection
- Cleaner background service worker with better state management