fix(web): preserve project scope through settings

[gsimone]

The selected sidebar project reset to All projects after visiting Settings because the thread sidebar owned the scope state and Settings replaces that component in the app sidebar slot.

Lift the ephemeral project scope to AppSidebarLayout, which spans both thread and Settings routes, and keep ThreadSidebar controlled by that owner. This preserves navigation state without persisting it across app reloads or introducing a global store.

Visual evidence

Atlas remains selected after opening Settings and returning to the thread view:

project-scope-settings-round-trip.mp4

Testing

• pnpm --filter @t3tools/web test src/components/AppSidebarLayout.test.tsx
• pnpm --filter @t3tools/web typecheck
• Targeted formatter and linter on the three changed files
• Integrated browser pass with disposable Atlas and Orbit project fixtures

Made with GPT-5.6-Sol in T3 Code using the Codex harness.

Note

Preserve project scope in AppSidebarLayout across settings navigation

• Moves projectScopeKey state from Sidebar into AppSidebarLayout so the selected project survives settings routes that unmount the thread sidebar.
• Sidebar now receives projectScopeKey and onProjectScopeKeyChange props, reporting project key or null for all-projects and invalidation.
• Adds a test harness with a minimal in-memory DOM and an integration test verifying scope persistence through a settings route round-trip.

^{Macroscope summarized 59479f8.}

[macroscopeapp]

Approvability

Verdict: Approved at 418c58b

Macroscope's review found this PR approvable — The PR makes a small, isolated UI state-lifetime fix: project scope is retained while the settings sidebar temporarily replaces the thread sidebar. Production changes are limited to existing sidebar components, and the navigation behavior is covered by a focused test.

^{You can add or adjust custom eligibility rules. Learn more.}

Dismissing prior approval to re-evaluate 418c58b

[gsimone]

@maria-rcks added visuals to this so it's easier to understand intend

[gsimone]

Superseded by #9416, which merged the same project-filter persistence behavior with persisted UI state and stale-project safeguards.