fix: explain file checkpoints require Git in revert notice

[marius-kilocode]

What Problem This Solves

Reverting a conversation in a folder that is not a Git repository cannot restore workspace files, but the notice only said "No file checkpoint was available". Users could not tell why the restore was skipped.

Why This Change Was Made

Checkpoints are backed by Git. Revert already reported snapshots-disabled when snapshots were turned off, but the non-Git case fell through to the generic unavailable status. This adds a dedicated not-a-git-repo revert status, resolved from the project VCS, so the client can explain the Git requirement instead of guessing.

User Impact

Reverting in a non-Git folder now shows: "Conversation reverted. File checkpoints require a Git repository, so workspace changes were not restored." The message is translated in all supported locales. The "Enable snapshots" action is not offered for this case, because enabling snapshots would not help.

Evidence

Verified in an isolated VS Code dev host against a disposable non-Git workspace: after the agent wrote hello.txt and the user reverted to the message, the new notice appeared and hello.txt stayed on disk.

Automated checks: backend revert test (includes the new non-Git state), extension unit suite, typechecks, lint, knip, and the opencode annotation check all pass.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

The change adds a dedicated not-a-git-repo revert status, resolved from ctx.project.vcs, so reverting in a non-Git folder explains the Git requirement instead of falling through to unavailable. I verified the branch ordering (checkpoint → not-a-git-repo → snapshots-disabled → unavailable) preserves existing behavior for Git repos, that the new literal is propagated consistently through Revert.State, Session.Revert, session-import, SessionTable, the generated SDK/client types, the RevertBanner consumer, and all locales, and that the new backend test uses a non-Git tmpdir while the existing snapshots-disabled/unavailable tests use { git: true }, keeping each branch deterministic. No memory-leak or lifecycle concerns: the change adds no listeners, subscriptions, or handles.

Files Reviewed (36 files)

• .changeset/revert-not-a-git-repo-notice.md
• packages/client/src/generated/types.ts
• packages/core/src/session/sql.ts
• packages/kilo-vscode/tests/unit/revert-checkpoints.test.ts
• packages/kilo-vscode/webview-ui/src/components/chat/RevertBanner.tsx
• packages/kilo-vscode/webview-ui/src/i18n/{ar,br,bs,da,de,en,es,fa,fr,it,ja,ko,nl,no,pl,ru,th,tr,uk,zh,zht}.ts
• packages/kilo-vscode/webview-ui/src/types/messages/sessions.ts
• packages/opencode/src/kilocode/server/httpapi/groups/session-import.ts
• packages/opencode/src/session/revert.ts
• packages/opencode/src/session/session.ts
• packages/opencode/test/kilocode/session/revert.test.ts
• packages/schema/src/revert.ts
• packages/schema/src/v1/session.ts
• packages/sdk/js/src/v2/gen/sdk.gen.ts
• packages/sdk/js/src/v2/gen/types.gen.ts
• packages/sdk/openapi.json

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_{Reviewed by deepseek-v4.1-flash · Input: 0 · Output: 0 · Cached: 0}

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