Task: Integrate AI design session freeze fix

Identity

Integrate the reviewed client fix from feature task 20260819-makelore-session-freeze-7c4e (3a6d388) into the client main base 31332f6.
Preserve the peer task 20260818-video-duration-server-config-7b4e and its occupied canonical worktree; do not rewrite main or any unrelated source.

Merge only the reviewed feature commit with a non-fast-forward integration commit; no reset, force update, stash, or destructive cleanup.
Keep the feature task record immutable and record integration evidence only in this integration task and the canonical current-state.md.
Leave the integration branch ready for promotion once the canonical main worktree is released by its owner.

Created merge commit 6478591 (merge: integrate AI design session freeze fix) with no conflicts. The merge contains the source task record, the connecting-stream reconciliation fix in src/stores/image-workspace.ts, and its regression test in tests/unit/image-workspace-store.test.ts.

Source worktree verification recorded by the feature task passed: focused store tests 31/31, adjacent Canvas/workspace tests 78/78, scoped ESLint, TypeScript --noEmit, git diff --check, documentation drift, and independent Sol review PASS.
Integration merge is clean and git diff --check is required after this record update. The isolated integration worktree initially lacked dependencies, so an additional dependency-backed integration test run is recorded separately if available; this does not invalidate the already-passing source verification.

Canonical client main remains owned by 20260818-video-duration-server-config-7b4e; after that task releases the worktree, promote 6478591 to main and rerun the focused verification on the canonical checkout.
Perform a real Electron smoke with a deliberately slow event-stream handshake to cover the production timing boundary; this remains a follow-up from the feature task.

6478591 / 3a6d388: update current-state.md under Integrated Through when the merge commit is promoted to canonical main.