feat: add latest work log editing

[okaryo]

Summary

• Add a shortcut to edit the latest Work Log entry
• Keep the original Work Log timestamp when editing
• Show Work Log date headings in English regardless of system locale
• Centralize app date formatting for consistent display

Checks

• pnpm run format:check
• pnpm run lint
• pnpm run check
• pnpm test
• pnpm run build

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Clear edit state when closing the entry panel

This cancellation logic only runs on Escape, so if the panel closes via focus loss (e.g., clicking another section or switching sections with shortcuts), editingWorkLog remains set. Reopening the input then stays in locked edit mode and Cmd+Enter updates the old log instead of creating a new entry, which can cause accidental overwrites; the edit state should be cleared on all close paths, not just the Escape handler.

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