fix: change Add to Context keybinding to avoid Redo conflict

[roomote]

Description

This PR fixes the keyboard shortcut conflict reported in #8652 where the "Add to Context" shortcut (Ctrl+Y/Cmd+Y) was overriding VS Code's standard Redo operation.

Changes

• Changed the "Add to Context" keyboard shortcut from:
  • Windows/Linux: Ctrl+Y → Ctrl+K Ctrl+A
  • Mac: Cmd+Y → Cmd+K Cmd+A

Why this change?

The previous shortcut conflicted with VS Code's standard Redo operation, which is a commonly used feature. The new chord combination (Ctrl+K Ctrl+A / Cmd+K Cmd+A) follows VS Code's convention for chord shortcuts and won't conflict with any standard operations.

Testing

• ✅ All existing tests pass (294 test files, 3858 tests)
• ✅ Type checking passes
• ✅ Linting passes

Breaking Change

⚠️ Users who have become accustomed to using Ctrl+Y/Cmd+Y for "Add to Context" will need to adapt to the new shortcut Ctrl+K Ctrl+A/Cmd+K Cmd+A.

Fixes #8652

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Important

Change Add to Context keybinding to Ctrl+K Ctrl+A/Cmd+K Cmd+A in src/package.json to avoid conflict with Redo.

• Keybinding Change:
  • Changed roo-cline.addToContext keybinding in src/package.json from Ctrl+Y/Cmd+Y to Ctrl+K Ctrl+A/Cmd+K Cmd+A.
  • Resolves conflict with VS Code's Redo operation.
• Testing:
  • All existing tests pass (294 test files, 3858 tests).
  • Type checking and linting pass.
• Breaking Change:
  • Users must adapt to the new shortcut Ctrl+K Ctrl+A/Cmd+K Cmd+A.

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