refactor(editor): centralize CodeMirror commands and keybindings

[bajrangCoder]

No description provided.

[greptile-apps]

Greptile Summary

This PR centralizes CodeMirror commands and keyboard shortcuts. The main changes are:

• Moves editor shortcuts into a shared command registry.
• Adds shortcut normalization, priority handling, and conflict reporting.
• Shares effective shortcuts with the terminal integration.
• Centralizes language-server command bindings.
• Adds custom fold-all and unfold-all commands for nested blocks.
• Expands editor tests for commands, shortcuts, and folding.

Confidence Score: 5/5

No new blocking issue qualifies for this follow-up review.

• No distinct unresolved production failure was found in the latest changes.
• The updated tests cover the main command, shortcut, and nested-fold behavior.

Important Files Changed

Filename	Overview
src/cm/commandRegistry.js	Centralizes command execution, shortcut resolution, conflict detection, and editor keymap updates.
src/cm/foldingCommands.js	Adds custom commands that discover and update nested folded ranges.
src/cm/keyBindingUtils.js	Adds shared shortcut normalization and conflict checks.
src/lib/keyBindings.js	Builds the shared application and CodeMirror shortcut catalog.
src/test/editor.tests.js	Adds coverage for generated shortcuts, conflicts, conventional bindings, and nested folding.

_{Reviews (2): Last reviewed commit: "fix fold all command same line thing" | Re-trigger Greptile}

[UnschooledGamer]

LGTM.