Fix web test failures from SSR theme import and Claude auth diagnostics

[Copilot]

What Changed

@okcode/web#test was failing for two independent reasons: useTheme touched localStorage during module import in non-browser test/SSR paths, and Claude authentication errors were not recognized by threadError, so the expected troubleshooting copy was never added.

• SSR-safe theme initialization

  • Added a browser capability guard in apps/web/src/hooks/useTheme.ts.
  • Wrapped localStorage reads/writes behind safe accessors.
  • Skipped module-load side effects (initCustomTheme(), initial applyTheme(...)) when no DOM is available.
  • Returned stable server snapshots / no-op subscriptions in non-DOM environments so static rendering tests can import components without crashing.

• Claude auth error detection

  • Expanded AUTH_FAILURE_PATTERNS in apps/web/src/components/chat/threadError.ts to match the Claude failure wording used in the failing tests.
  • This restores the expected troubleshooting tip generation for Claude login failures.

const canUseDOM = typeof window !== "undefined" && typeof document !== "undefined";

function safeLocalStorageGet(key: string): string | null {
  if (!canUseDOM) return null;
  try {
    return window.localStorage.getItem(key);
  } catch {
    return null;
  }
}

Why

The failing import path was executing browser-only theme code in a server/test environment, which caused ReferenceError: localStorage is not defined before the test could render. Separately, the auth matcher only recognized run claude auth login phrasing, but the actual error said authenticated with claude auth login, so auth failures were misclassified and the expected diagnostic tip was omitted.

UI Changes

None.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Project	Deployment	Actions	Updated (UTC)
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