[Feat] Add cron tasks management UI (#161)

[samzong]

Summary

Full cron job management panel for ClawWork — create, edit, delete, toggle, run, and monitor recurring agent tasks directly from the desktop client.

Type of change

• [Feat] new feature
• [UI] UI or UX change

Why is this needed?

OpenClaw Gateway exposes a rich cron scheduling system (cron.* RPCs) but ClawWork had no UI for it. Users had to manage cron jobs via CLI or raw API calls. This PR adds a first-class scheduling interface as a main area view.

What changed?

• CronPanel — main area view with job list, filter tabs (All/Enabled/Disabled), search, gateway selector with scheduler status indicator, pagination
• CronJobDialog — create/edit dialog with cron expression presets (every 5 min, hourly, daily 9 AM, weekdays 9 AM, every Monday), human-readable preview via cronstrue, interval unit selector (minutes/hours/days), advanced options (model, thinking, delivery, failure alerts)
• CronJobCard — job card with toggle, status dot, schedule badge, action buttons (run, history, edit, delete)
• CronRunHistory — inline run history table per job with expandable summary/error, Open Task navigation
• Session identity fix — cron jobs now use store-key format (agent:main:clawwork:<deviceId>:task:<uuid>) and register a local task on creation, so cron-created conversations appear in the task list and events route correctly
• deleteAfterRun fix — explicitly send false to prevent server defaulting one-shot jobs to auto-delete
• Titlebar drag fix — removed global fixed z-50 overlay from App.tsx; each panel header owns its own drag region via titlebar-drag class, eliminating recurring z-index bugs
• Removed request-key infrastructure — buildSessionRequestKey, request-key regexes, and related code removed from shared/constants since store-key format is now used consistently
• All filter fix — send enabled: 'all' explicitly to server instead of undefined (server defaults to enabled-only)

Architecture impact

• Owning layer: shared / main / preload / renderer
• Cross-layer impact: yes — new cron RPC methods added to GatewayClient (main), preload bridge, and renderer components
• Invariants touched from docs/architecture-invariants.md: session key format (store-key used for cron session identity)
• Why those invariants remain protected: cron jobs use buildSessionKey() — the same function normal tasks use — ensuring consistent session identity

Validation

• pnpm lint
• pnpm test
• Manual smoke test

pnpm check (lint + architecture + format + typecheck + test) passes.
Manually tested: create/edit/delete/toggle/run cron jobs, verify task list sync,
filter tabs, search, run history, preset cron expressions, interval unit selector.

Screenshots or recordings

Schedule presets with human-readable cron description, interval unit selector (minutes/hours/days), inline run history below job cards.

Release note

• User-facing change. Release note is included below.

Add Scheduled Tasks panel for managing recurring agent tasks with cron expressions, interval scheduling, one-shot timers, run history, and task list integration.

Checklist

• The PR title uses at least one approved prefix: [Feat]
• The summary explains both what changed and why
• Validation reflects the commands actually run for this PR
• Architecture impact is described and references any touched invariants
• Cross-layer changes are explicitly justified
• The release note block is accurate

[github-actions]

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