feat: UI tweaks

[normenmueller]

feat/ui-tweaks

Task card affordances and visible-property inheritance

This change set refines task card affordances (clear click cues) and ensures subtasks inherit the parent card’s visible properties so metadata stays consistent across levels.

Examples (illustrative):

• Inline task cards show a pointer on the title to clarify clickability.
• Project cards keep the chevron visible when it appears on the right.
• Subtasks mirror the parent card’s visible properties.

Changelog

• Add pointer cursor cues to clickable task card controls and inline titles.
• Mark project task cards and keep right-side chevrons visible.
• Persist resolved visible properties on cards and apply them to subtask rendering.

Tests

• npm run i18n:sync
• npm run lint (warnings only; matches main)
• npm run typecheck
• npm run test:ci -- --verbose (fails: due-date-timezone-inconsistency test, same as main)
• ./node_modules/.bin/jest tests/unit/ui/TaskCard.test.ts --runInBand
• npm run test:integration
• npm run test:performance (no tests found)
• npm run build (missing OAuth IDs warning, same as main)
• npm run test:build

cf. PR.md