test(Tasks): Add comprehensive test suite for Tasks component

[ShivaGupta-14]

Description

• Add tests for Keyboard Navigation (ArrowUp, ArrowDown, boundary stops)
• Add tests for Hotkey Shortcuts ('a', 'c', 'd', 'e', 'f', 'p', 'r', 's', 't')
• Add tests for complete/delete hotkeys when dialog is already open
• Add tests for Sync button click and error toast on sync failure
• Add tests for LocalStorage persistence (tasksPerPage, lastSyncTime)
• Add tests for sync time auto-update interval
• Add tests for error handling (add task, edit task failures)
• Add tests for mouse hover handlers (mouseEnter, mouseLeave)

Updates: #300

Checklist

• Ran npx prettier --write . (for formatting)
• Ran gofmt -w . (for Go backend)
• Ran npm test (for JS/TS testing)
• Added unit tests, if applicable
• Verified all tests pass
• Updated documentation, if needed

Additional Notes

Screenshots

• Updated:

[github-actions]

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[its-me-abhishek]

@ShivaGupta-14 can not review this PR as there are too many changes, please open separate PRs for each sub component if possible (or a set of sub components). Closing for now.

[ShivaGupta-14]

ok, I will open separate PRs