Make tasks reflect PR state reactively

[bborn]

Summary

This PR implements reactive checking of PR state to automatically close tasks when their PRs are merged. The implementation ensures that tasks are updated immediately when users interact with them, providing a better user experience.

Key Changes

1. Executor Enhancements (internal/executor/executor.go)

• Added PRCache to Executor struct for caching GitHub PR status
• New CheckPRStateAndUpdateTask() public method to check PR state on demand
• Enhanced isBranchMerged() to prioritize GitHub PR status check via gh CLI
• Added PR cache initialization in both New() and NewWithLogging()

2. UI Integration (internal/ui/app.go)

• Check PR state when opening task detail view via loadTask()
• Check PR state when closing task detail view (Back key handler)
• Check PR state when manually closing a task (Close key handler)
• Batch check all task PR states when loading dashboard
• Force fresh PR info fetch when opening task details

3. Automatic Task Closure

• Tasks are automatically closed when PR is detected as merged
• Works reactively on:
  • View open/close
  • Dashboard refresh
  • Background check cycle (every 30 seconds)
• Logs the reason for automatic closure for transparency

Test Plan

• Build succeeds without errors
• Code follows existing patterns in the codebase
• Test with a task that has a merged PR
• Verify task closes when opening detail view
• Verify task closes when returning to dashboard
• Verify dashboard batch check works

Impact

This addresses the issue where tasks with merged PRs would remain in non-done states until the next background check cycle (30 seconds). Now tasks are checked reactively whenever the user views them or navigates the UI.

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