docs(checkpoints): document revert banner warnings and snapshot restoration

[emilieschario]

What changed

Added two pieces of documentation to the Checkpoints page (packages/kilo-docs/pages/code-with-ai/features/checkpoints.md):

1. A note callout explaining that workspace restoration requires snapshots. If snapshots are disabled or the reverted range has no stored checkpoint, only the conversation is rewound while the agent's file changes remain on disk.

2. A description of the revert banner warning states shown when a revert could not restore workspace files:

   • Snapshots disabled — banner explains file changes were not restored and offers an Enable snapshots button linking to Settings → Checkpoints.
   • No checkpoint available — banner explains no file checkpoint was available, so workspace changes remain on disk (e.g. when reverting a range that predates checkpoints).

Why

These behaviors exist in the extension but were not documented. Users reverting when snapshots are off or for ranges lacking a checkpoint would only have their conversation rewound without the file changes being restored — documenting the banner warning states helps users understand what happened and how to enable snapshots.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 files)

• packages/kilo-docs/pages/code-with-ai/features/checkpoints.md

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_{Review guidance: REVIEW.md from base branch main}