feat(security): Add activation warning modal

[mathe00]

Implement a modal dialog that warns the user about potential risks when enabling a Python script for the first time or re-enabling it. This forces a deliberate confirmation step.

• Create a new ActivationWarningModal.ts component extending Modal.
• Modal should display a clear, translated warning message (using t()) about execution risks (file access, network, etc.) and link to the security section in the README.
• Modal should have a prominent "Activate Anyway" button (text via t()) and a way to cancel (e.g., close button, Esc).
• Modify PythonBridgeSettingTab.ts:
  • In the onChange handler for the "Script Enabled" toggle:
    • If toggling from false to true, prevent immediate state change.
    • Instantiate and open ActivationWarningModal.
    • Pass a callback function to the modal.
    • The callback (executed only on "Activate Anyway" click) should set activationStatus[relativePath] = true, save settings, and refresh the UI (this.display()).
    • If the modal is cancelled, ensure the toggle visually remains/returns to false.
  • If toggling from true to false, update the setting directly as before.