Feature: keyboard shortcut for 'Open today's daily note'

[thetechjon]

Context

Calendar daily notes are a core flow in noteser. The Calendar sidebar UI lets you click a date to open / create that day's note. Obsidian users coming to noteser expect a keyboard shortcut — Obsidian binds Ctrl/Cmd+T-ish hotkeys for "Open today's daily note". noteser currently has no equivalent fast path.

Where to look

• src/utils/commands.ts — the central command registry. Other commands (open Settings, open Templates, etc.) live here.
• src/utils/keyboardShortcuts.ts (or src/hooks/useKeyboardShortcuts.ts) — where shortcuts are wired.
• src/components/sidebar/CalendarView.tsx — has the "open daily note for date" logic; the new command should reuse the same path.
• src/help/content.ts — shortcut documentation rendered in /help. Add a row.

Acceptance criteria

• New command "Open today's daily note" added to commands.ts.
• Default shortcut Ctrl+Shift+T (configurable like the other shortcuts).
• If today's daily note exists → open it. If it does not → create it from the configured daily-note template, then open.
• Shortcut row added to /help page.
• No regression in the Calendar UI (clicking still works the same).

Complexity

Small.

For first-time contributors

Read CONTRIBUTING.md. npm install, npm run dev. Existing commands in commands.ts are good templates to copy. PR against dev.