fix(projects): wait for cleanup before local deletion

[alichherawalla]

Recovered outcome

A project and its chats stay available when Mobile cannot finish knowledge cleanup. Both project delete surfaces now show the refusal reason.

Scope

• Await the Mobile RAG cleanup before removing project and chat links.
• Return one typed delete outcome from the project store.
• Keep the project and chats on cleanup failure.
• Show the returned reason in the existing Mobile alert surface.

Passed checks

• Live iOS Simulator flow: opened Code Review, confirmed deletion, returned to Projects, and verified that the project was absent.
• Project store checks: 32 passed, including cleanup refusal preservation.
• Focused ESLint passed.
• Full Mobile TypeScript check passed after refreshing the ignored local Shared package output.
• Diff checks passed.

Open gates

• The iOS Release simulator build fails because the installed llama.rn package has no ios-arm64_x86_64-simulator XCFramework slice.
• All available physical iPhones are offline, so physical-device proof is open.
• The live cleanup-refusal state and visual inspection are open because this task prohibits Computer Use. Simulator screenshots were captured but not visually inspected.
• No E2E tests were added, as requested.

This PR must remain draft while these required gates are open.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud