feat(tasks): add task archiving beta feature

[filipexyz]

Summary

Adds a task archiving beta feature that allows users to toggle the visibility of the archived column on the kanban board.

Screen.Recording.2025-11-28.at.22.48.21.mov

Changes:

• Add task_archiving beta feature config in beta-features.toml
• Hide archived column from kanban by default when beta feature is enabled
• Add "Archived" button in breadcrumb row to show/hide the archived column
• Users can drag tasks to/from the archived column to archive/unarchive

How it works:

1. Enable "Task Archiving" in Settings > Beta Features
2. Archived column is hidden by default
3. Click "Archived (N)" button to show the column
4. Drag tasks to archived column to archive, drag out to unarchive
5. Click button again to hide the column

Test plan

• Enable beta feature in Settings > Beta Features
• Verify archived column is hidden on kanban board
• Click "Archived" button and verify column appears
• Drag a task to archived column
• Drag a task out of archived column to unarchive
• Click button again to hide column
• Disable beta feature and verify archived column shows normally

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @filipexyz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request delivers a significant new capability by introducing a 'Task Archiving' beta feature. This feature empowers users to manage their task boards more effectively by allowing them to archive tasks and control the visibility of an 'Archived' column. The changes span both the backend, with a new service for managing beta feature flags, and the frontend, with UI components for interacting with archived tasks and a dedicated settings page for beta features.

Highlights

• New Beta Feature: Task Archiving: Introduces a new 'Task Archiving' beta feature, allowing users to hide and show an 'Archived' column on the Kanban board.
• Interactive Archiving: Users can drag tasks to and from the 'Archived' column to archive or unarchive them, providing a flexible way to manage task visibility.
• Backend Beta Feature Management: Adds a robust backend service for defining, listing, and toggling beta features, with configurations loaded from a TOML file and states persisted in a database.
• Frontend Beta Feature UI: Implements a new 'Beta Features' settings page in the UI where users can enable or disable experimental features, along with a dedicated 'Archived' button in the breadcrumb for quick access to archived tasks.

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[gemini-code-assist]

Code Review

This pull request introduces a robust beta feature flag system, which is a significant and well-executed addition. The backend implementation in Rust is solid, with a new service for managing features, database persistence, and corresponding API endpoints. The frontend work is also well-structured, featuring a new React context for state management and a settings page for users to toggle features. The 'task archiving' feature is correctly implemented using this new system.

My review focuses on a few areas to enhance maintainability and robustness, such as reducing code duplication in the new BetaFeaturesService, improving error handling to be less reliant on string matching, and making a hardcoded file path more flexible for different deployment scenarios. These are minor points in an otherwise excellent pull request.