feat: Add Tasks feature

[VariableThe]

Adds Tasks feature and onboarding docs

Summary by CodeRabbit

• New Features
  • Introduced Tasks & Reminders: Create tasks using the /task command with optional due dates and times
  • Access the unified Tasks view via Cmd+T (or Ctrl+T on Windows/Linux) to view all tasks
  • Overdue tasks are highlighted in red for easy identification
  • Receive OS notifications when task reminders come due
  • Added "Reminders" button to the main action menu
  • Updated documentation with Tasks feature details

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6992e55a-1878-4d86-819a-f36c2352aa6f

📥 Commits

Reviewing files that changed from the base of the PR and between c0d1328 and e36a94c.

📒 Files selected for processing (7)

• README.md
• electron/main.ts
• electron/preload.ts
• features.md
• src/App.css
• src/App.tsx
• src/components/RemindersPage.tsx

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📝 Walkthrough

Walkthrough

Adds a Tasks & Reminders system: /task inline tokens in CodeMirror are decorated with a ReminderWidget (checked/overdue states), auto-timestamped via remConverterPlugin, and aggregated in a new RemindersPage overlay. OS notifications fire for due reminders. Cmd+T is wired end-to-end via Electron IPC through preload to toggle the Tasks view.

Changes

Tasks & Reminders Feature

Layer / File(s)	Summary
Electron Cmd+T IPC wiring and help docs electron/main.ts, electron/preload.ts	Adds a web-contents-created listener intercepting Ctrl/Cmd+T and forwarding trigger-tasks IPC to the renderer; exposes onTriggerTasks via contextBridge; writes commands/tasks.md help file; updates welcome checklist with a [7. Tasks] entry.
ReminderWidget and inline task decoration src/App.tsx, src/App.css	Introduces ReminderWidget (checked/overdue states, click-to-toggle dispatch) and extends the CodeMirror decoration builder to recognize /task//task-done, compute overdue status from an optional (YYYY-MM-DD HH:MM) datetime, and apply per-line styling; adds CSS for all rem widget states including overdue red.
remConverterPlugin: auto-timestamp insertion src/App.tsx	Adds remConverterPlugin ViewPlugin that auto-inserts the current timestamp after /task//task-done + space, and converts shorthand suffixes (@ 10m, @ tmrw, etc.) into absolute YYYY-MM-DD HH:MM strings via async document dispatch.
RemindersPage component src/components/RemindersPage.tsx	New React overlay that parses all notes via regex into ReminderItem structs with done state, timestamps, and match metadata; sorts by done/target precedence; renders a themed full-screen panel with overdue/imminent coloring, toggle-reminder marker, and navigate-to-note row click.
App state, notification polling, and RemindersPage wiring src/App.tsx	Adds showRemindersView state, Cmd/Ctrl+T keyboard shortcut, onTriggerTasks Electron callback, OS notification permission request with a 10-second polling interval that fires deduplicated notifications via localStorage, conditional RemindersPage render with note-edit and CodeMirror dispatch callbacks, and a Reminders action-menu entry.
Documentation README.md, features.md	Adds /task command description and Cmd+T shortcut entry to README.md; adds Tasks & Reminders bullet to features.md.

Sequence Diagram

sequenceDiagram
  participant User
  participant Electron as electron/main.ts
  participant Preload as electron/preload.ts
  participant App as App.tsx
  participant RemindersPage as RemindersPage.tsx
  participant OS as OS Notifications

  User->>App: types /task + space in editor
  App->>App: remConverterPlugin inserts timestamp

  User->>Electron: presses Cmd+T
  Electron->>App: contents.send('trigger-tasks')
  Preload->>App: onTriggerTasks callback
  App->>RemindersPage: renders overlay (showRemindersView=true)
  RemindersPage->>RemindersPage: parses notes into ReminderItems

  App->>App: 10s interval scans due reminders
  App->>OS: Notification (deduplicated via localStorage)

  User->>RemindersPage: clicks task row
  RemindersPage->>App: onNavigateToNote + onClose
  App->>App: navigate to note, hide overlay

  User->>RemindersPage: clicks circle marker
  RemindersPage->>App: onToggleReminder(noteId, from, to, insert)
  App->>App: saveNote + dispatch CodeMirror change

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

• VariableThe/PaperCache#3: Adds a similar inline CodeMirror widget system (/check tokens) using the same decoration builder and widget dispatch pattern that this PR extends for /task//task-done tokens.

Poem

🐇 A rabbit hops by, timer in paw,
/task in the editor, no deadline left raw.
Cmd+T swings open a Tasks page so neat,
Overdue glows red — no reminder's defeat.
🔔 Ding! The OS notifies, "Time's come to hop!"
Your tasks are all tracked now — the forgetting must stop.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/tasks

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