fix: include global mode rules files in export

[roomote]

This PR fixes issue #5834 where global mode exports were not including rules files from the global .roo directory.

Problem

The exportModeWithRules method in CustomModesManager.ts was only checking for rules files in the workspace directory, even for global modes. This meant that when exporting a global mode, any rules files stored in the global ~/.roo/rules-{mode-slug}/ directory were not included in the export.

Solution

Modified the export logic to determine the correct rules directory based on the mode source:

• Global modes: Check getGlobalRooDirectory()/rules-{slug}/
• Project modes: Check workspacePath/.roo/rules-{slug}/ (existing behavior)

Changes

• Updated exportModeWithRules method to use mode source to determine rules directory
• Fixed relative path calculation to work correctly for both global and project modes
• Maintains backward compatibility for project modes

Testing

The fix ensures that:

1. Global modes now include their rules files in exports
2. Project modes continue to work as before
3. Exported YAML files contain the correct relative paths for rules files

Fixes #5834

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Important

Fixes exportModeWithRules to include global mode rules files from the global .roo directory in exports.

• Behavior:
  • Fixes exportModeWithRules in CustomModesManager.ts to include rules files from global .roo directory for global modes.
  • Maintains existing behavior for project modes.
• Logic:
  • Determines rules directory based on mode source: global modes use getGlobalRooDirectory()/rules-{slug}/, project modes use workspacePath/.roo/rules-{slug}/.
  • Corrects relative path calculation for rules files in both global and project modes.
• Testing:
  • Ensures global modes include rules files in exports.
  • Confirms project modes remain unaffected.
  • Validates exported YAML files have correct relative paths for rules files.

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