[ApolloF]

Addresses the three findings from the review of the extra #21 commits:

• Protect re-added Drive backups from mass deletion: remove the game from Forgotten when local backup files return, with a regression test (09716b3; internal/gdrive/sync.go and sync_test.go).
• Avoid a lasting split error on PCs that do not sync the game: check for nothing to do before returning ErrSplitLink, with TestSplitThroughLinkNotSyncedHere. Already fixed in 753ee64 and included in the base branch; no duplicate change is needed.
• Reject Windows short-name aliases with trailing dots or spaces, with test coverage (141a3f8; internal/paths/real.go and real_test.go).

Verification on the current head:

• go vet ./...: passed.
• go test ./...: passed (some package results cached).
• npm run check: passed, 0 errors and 0 warnings.
• npx vitest run: passed, 4 files and 31 tests.
• wails build: passed (binding generation printed time.Time diagnostics).

[ApolloF]

Replaced by #57. The Drive fix was already merged in #31.