Add clock dashboard dropdown

[fveracoechea]

Summary

• add a reusable per-screen animated dropdown surface owned by the Surface Manager and opened from the bar clock
• add a responsive, non-uniform dashboard grid with calendar navigation, Open-Meteo weather, user identity, system details, performance meters, and a large clock
• keep platform state in Feature Services and normalization in pure JavaScript models with deterministic coverage
• extend the feedback contract with production-QML compilation and a composed dashboard smoke fixture

Verification

• just format
• just lint
• just typecheck
• just test (98 passed)
• just smoke (4 cases passed)
• just check
• just dev (real shell loaded cleanly; live trigger-mapping warning found, fixed, and covered by tst_trigger_map.qml)
• wide 752 px and narrow 600 px offscreen dashboard previews

Notes

• Weather coordinates are currently pinned in Modules/Weather.qml; location search and provider configuration remain out of scope.
• The dashboard uses one consistent grid gap while section spans and heights follow their content.

Resolves #16
Part of #12