feat(app): sync session groups server-side

[src-opn]

Summary

• Store session groups and assignments server-side in the runtime SQLite DB
• Add session group APIs plus update events so clients can sync group state
• Add client-side migration from existing local group state and show "Create a Group" next to "Show x more" when no groups exist

Tests

• pnpm --filter openwork-server test src/session-groups.e2e.test.ts
• pnpm --filter openwork-server typecheck
• pnpm --filter @openwork/app typecheck
• Manual desktop smoke: ran pnpm dev from the worktree with Electron CDP on http://127.0.0.1:9830; verified migration PUT, session-groups/events polling, "Show 2 more ⋅ Create a Group", creating a Test Group, and server persistence/events in the UI

[vercel]

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Project	Deployment	Actions	Updated (UTC)
openwork-app	Ready	Preview, Comment	Jun 13, 2026 12:30pm
openwork-den	Ready	Preview, Comment	Jun 13, 2026 12:30pm
openwork-den-worker-proxy	Ready	Preview, Comment	Jun 13, 2026 12:30pm
openwork-landing	Ready	Preview, Comment, Open in v0	Jun 13, 2026 12:30pm

[cubic-dev-ai]

4 issues found across 10 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[src-opn]

Addressed the four issues identified by cubic in b5bc18c:

• Added per-workspace client sync versions so stale session-group responses cannot overwrite newer optimistic/server state.
• Made session-group event polling single-flight to avoid overlapping refresh loops.
• Serialized server read-modify-write session-group updates per workspace to avoid lost concurrent writes.
• Changed the session-group event buffer to be per-workspace so busy workspaces cannot evict quiet workspace events.

Validation:

• pnpm --filter openwork-server test src/session-groups.e2e.test.ts
• pnpm --filter openwork-server typecheck
• pnpm --filter @openwork/app typecheck

[cubic-dev-ai]

1 issue found across 5 files (changes from recent commits).

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[src-opn]

Addressed the new issue identified by cubic in f8c316c:

• Reworked client mutation response handling so successful older server responses are retained while newer mutations are pending.
• If a newer mutation fails, the latest successful pending response is applied once all pending mutations settle, preventing UI/server divergence while still avoiding stale overwrites of newer optimistic state.
• Full background/poll syncs now skip applying while local mutations are pending.

Validation:

• pnpm --filter @openwork/app typecheck
• pnpm --filter openwork-server test src/session-groups.e2e.test.ts
• pnpm --filter openwork-server typecheck

[cubic-dev-ai]

2 issues found across 2 files (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>

[src-opn]

Addressed the latest two issues identified by cubic in 0538d5f:

• Added a separate server-sync freshness version so out-of-order getSessionGroups responses cannot apply stale data.
• Buffered the latest server sync result while local mutations are pending, then apply it if all pending mutations settle without a newer successful mutation response.
• Successful mutation responses still take precedence over deferred server sync data.

Validation:

• pnpm --filter @openwork/app typecheck
• pnpm --filter openwork-server test src/session-groups.e2e.test.ts
• pnpm --filter openwork-server typecheck

[cubic-dev-ai]

1 issue found across 2 files (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>

[src-opn]

Addressed the latest issue identified by cubic in 89d5ccf:

• Deferred server sync state is now applied after pending mutations finish even if a newer sync has since started but not applied yet.
• The freshness guard still prevents stale sync responses from becoming deferred in the first place; this only prevents dropping the last valid deferred state during mutation settlement.

Validation:

• pnpm --filter @openwork/app typecheck
• pnpm --filter openwork-server test src/session-groups.e2e.test.ts
• pnpm --filter openwork-server typecheck