Visor: keyboard navigation, mobile rows, and legibility

[lannbot]

Summary

• Fix UI review findings 1, 3, and 8: explicit drawer dismissal and Escape, focus transfer/return, inert app and outgoing panes, and named unsaved-change confirmation that preserves its pending action.
• Constrain device identifiers to keyboard-accessible local scrolling and wrap status rows at 320px/390px without overlap.
• Keep the saturated identity palette with high-contrast dark strip text, 44px control heights, visible focus rings, clearer section headings, and bounded desktop inputs.
• Add five Chromium regression scenarios covering keyboard/dialog behavior, reduced motion, narrow layouts, identifier readability, and all 360 hues.

Verification

• Astra review completed, including a reproduced and corrected scrim/confirmation action-replacement bug.
• just check passed.
• just test passed (156 Rust tests plus Deno suites).
• just e2e passed (27 scenarios) after merging current main's app-install changes.
• Additional Chromium probes confirmed Escape restores the edited input, scrim clicks do not replace a pending sheet switch, and desktop fields are bounded at 384px.

Automerge will be armed with merge commits. Browser verification uses real Chromium; physical mobile devices and other browser engines were not tested.