[FEATURE] Implement Customizable/Editable Keyboard Shortcuts

Problem

Currently, keyboard shortcuts in OpenCut are hardcoded and cannot be modified by the user. This limits workflow efficiency, especially for users coming from other NLEs (Non-Linear Editors) like Premiere Pro or DaVinci Resolve, or those with non-QWERTY keyboard layouts.

Problem:

Hardcoded shortcuts may conflict with system-level hotkeys or other background applications.

Lack of flexibility for professional editors who rely on muscle memory from other software.

Solution

Introduce a "Keyboard Shortcuts" section in the Settings panel that allows users to:

View all current keybindings.

Remap existing shortcuts to custom key combinations.

Save and export/import shortcut profiles.

Alternative

The current shortcuts-dialog.tsx provides a view-only list. This needs to be expanded into an interactive configuration menu.

Anything else?

No response

Start with shortcuts-dialog.tsx and the Settings panel to understand the current view-only keybinding list and how shortcuts are exposed. Done means users can view, remap, save, export, and import shortcut profiles, including support for custom key combinations.