[okisooo]

Timestamp-only panel updates rebuilt every dashboard control. This change keeps those controls when only collection time changes, reuses frozen brushes, and replaces frequent file probes with debounced notifications plus a recovery timer. Live glass hands off frames at its existing 60 Hz capture rate instead of continuously subscribing to display-rate rendering; entrance/exit motion keeps its existing timing.

Carries forward the currently installed popup polish as a separate commit. Layout, fonts, themes, dashboard navigation, account status and collectors are preserved. Capture workers stop before reopening; window resources and error logs have bounded ownership.

Validation:

• 310 unit tests pass with Credential Manager reads mocked; the unisolated suite has one pre-existing environment-dependent account-discovery assertion.
• Native build: zero warnings/errors. Dashboard interaction checks pass, including same HWND, refresh, scroll, navigation and rapid reopen.
• Eight before/after static renders are pixel-identical across usage, dashboard, settings and provider detail in both themes.
• 100 unchanged refreshes: managed allocations in the Python/CLR test host fall from 418 MiB to about 81 MiB; all 100 retain controls. Coverage, settings, summary and account status changes still rebuild.
• 100 open/close/navigation cycles show a bounded late-cycle memory/handle range. This is a short synthetic/offscreen workload, not a multi-day leak guarantee.
• Standalone samples distinguish private resident memory, working set and private commit. Startup memory is roughly unchanged, with a small watcher cost; no trimming or forced collection.

See docs/performance.md for reproducible checks and measurement limits. No public binary release is created by this PR.