Send custom modes to the extension bridge

[cte]

Send all mode to the extension bridge.

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Important

Enhance getModes() in ClineProvider.ts to include custom modes from customModesManager.

• Behavior:
  • getModes() in ClineProvider.ts now includes custom modes from customModesManager in addition to DEFAULT_MODES.
  • If customModesManager.getCustomModes() fails, it falls back to returning only DEFAULT_MODES.

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[roomote]

Thank you for your contribution! The implementation successfully adds custom modes to the extension bridge, which is a valuable enhancement. The code is clean and follows existing patterns well.