ui: drop the Live view submenu; turn nav into a 64x64 icon rail
All grid/play/fullscreen submenu items are removed from every sidebar (index, archive, settings, layout) — those controls now live in the live grid footer. The sidebar becomes a narrow 72px rail and Live/Archive/Settings render as 64x64 icon tiles (icon + small caption, active = inset red ring). The layout.html gear (only link to /layout) is dropped with its submenu, so the layout editor is now reachable by URL only. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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