Feature: Allow removing/reassigning keyboard shortcuts

[arnestrickmann]

Feature Request

Description
Users should be able to disable or reassign existing keyboard shortcuts. Currently, keybindings are fixed and can't be removed or remapped — so if a user doesn't need a shortcut (e.g., theme toggle) and wants to use that key combination for something else (e.g., Cmd+T for new task), they can't.

Use Case

A user wants to:

1. Remove the theme toggle keybinding (they don't use it)
2. Reassign Cmd+T to "New Task" instead

This isn't possible today.

Expected Behavior

• View all current keybindings in settings
• Disable/remove a keybinding (frees up the key combination)
• Reassign a key combination to a different action
• Detect and warn on conflicts (two actions mapped to the same shortcut)
• Reset to defaults option

Suggested UX

• A "Keyboard Shortcuts" section in settings showing all bindings in a list
• Each binding has: action name, current shortcut, and an edit/remove button
• Clicking edit lets the user press a new key combination to record it
• A clear/remove button to unset the shortcut entirely
• Search/filter to quickly find a specific action