Add Today session filter and Remove Project option

[dtannen]

Summary

• Today filter: New toggle button in session filters that shows only sessions modified today (local date), with a calendar icon matching the existing filter button style
• Remove Project: New button in project settings that hides a project from the sidebar (with confirmation dialog). Hidden projects are persisted in global settings and can be restored by re-adding via the Add Project button
• Styling for both features matches existing UI patterns (filter button states, settings form layout)

Test plan

• Click the Today filter button — only sessions from today should appear
• Combine Today with other filters (live, pinned, archived) — should work together
• Open project settings for an empty project and click Remove Project — project should disappear from sidebar
• Use Add Project to re-add a previously removed project — it should reappear

🤖 Generated with Claude Code

[abasiri]

First PR! Nice. Looks good will pull it in.

[abasiri]

It's in v0.0.5 - auto updater was broken, so you need to manually update to this version, should be fixed going forward.