Fix GitHub API timeouts and surface timeout warnings

[stylessh]

Summary

• Disable Octokit throttle and retry plugins across all client factories (user, installation, app auth). The throttle plugin's Bottleneck library classifies all GraphQL as "write" with maxConcurrent: 1, minTime: 1000ms, serializing requests one per second — causing 15s operation timeouts despite GitHub API responding in <1s.
• Surface timeout warnings in the dashboard bottom bar. Adds a timedOut flag to search results (pulls/issues) and a global server-side timeout tracker so timeouts from any code path (pull detail, timeline, cross-refs) are detected. Displayed as a red dismissible warning.
• Add error severity support to the warning system. Bottom bar now renders red styling for severity: "error" warnings vs the existing yellow for default warnings.

Test plan

• Open dashboard with multiple installations — verify no more timeout errors in console
• Simulate a timeout (e.g. lower GITHUB_OPERATION_TIMEOUT_MS to 1ms) and verify red warning appears in bottom bar
• Verify existing yellow forbidden-org warnings still render correctly
• Verify warning auto-clears when next successful query returns timedOut: false

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	diffkit	b58bc5c	Commit Preview URL Branch Preview URL	Apr 13 2026, 06:49 PM