Fix completion actions: default to PR and support remote repos (#21)

* Fix completion actions: default to PR and support remote repos

- Change default completion action from 'branch' to 'pr' for tasks
  using daemon working directory
- Allow PR completion action to work without target_repo_path if the
  worktree already has an origin remote configured (e.g., when cloned
  from a remote URL)
- Update create_pull_request to accept optional target_repo parameter

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add dismiss functionality for completed standalone tasks

## Changes

### Backend
- Add 'hidden' field to Task model (models.rs)
- Add database migration for hidden column (20250122000000_add_task_hidden.sql)
- Update task listing queries to include hidden field and filter out hidden tasks
- Update update_task_for_owner to handle hidden field

### Frontend
- Add hidden field to TaskSummary interface (api.ts)
- Add dismissTask API function (api.ts)
- Add hideTask function to useTasks hook
- Add Dismiss button to TaskList for completed standalone tasks
- Wire up onDismiss handler in mesh.tsx route

## Behavior
- Completed standalone tasks (tasks without a contract) show a "Dismiss" button
- Dismissing a task sets hidden=true and removes it from the task list
- Hidden tasks are filtered out by default in all task listing queries

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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