Bring back checkpoints on Windows

[mrubens]

We can bring this back now that #939 is merged right?

---

Important

Re-enable checkpoints on Windows by removing platform-specific restrictions in Cline.ts, CheckpointService.ts, and updating SettingsView.tsx.

• Behavior:
  • Re-enable checkpoints on Windows by removing platform check in Cline.ts and CheckpointService.ts.
  • Update SettingsView.tsx to allow enabling checkpoints on Windows.
• Code Changes:
  • Remove process.platform check in Cline constructor.
  • Remove Windows-specific error in CheckpointService.create().
  • Update tests in CheckpointService.test.ts to reflect changes.
• UI:
  • Remove Windows restriction for enabling checkpoints in SettingsView.tsx.

^{This description was created by for 8576809. It will automatically update as commits are pushed.}

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