fix(ui): improve error message specificity in NewsPanel and PWA registration

[NewCoder3294]

Summary

• NewsPanel.ts: Replaced generic "Could not generate summary" and "Summary failed" with contextual messages that include the error category (e.g. "Summary failed (timeout)", "Summary unavailable (no providers responded)")
• InsightsPanel.ts: Replaced generic "Analysis failed - retrying..." with categorized error reason (e.g. "Analysis failed (network error) - retrying...")
• main.ts: Replaced silent .catch(() => {}) on service worker registration and the hourly update interval with console.warn logging that includes the error object, aiding offline-mode debugging
• Added classifyError() static helper to both NewsPanel and InsightsPanel that maps common error types (timeout, network, rate limit, auth, server error) to concise user-facing labels without exposing internal details

Details

Error classification categories:

Error type	User-facing label
AbortError DOMException	request cancelled
TypeError with fetch/network	network error
Message contains "timeout"	timeout
Message contains "429" / "rate" / "quota"	rate limited
Message contains "401" / "403" / "unauthorized"	auth error
Message contains 5xx pattern	server error
Anything else	unexpected error

All developer-facing console.warn calls include the full error object for debugging.

Test plan

• Trigger summary generation with API providers down — verify message shows "Summary unavailable (no providers responded)" instead of "Could not generate summary"
• Simulate a network error during summary — verify message shows "Summary failed (network error)"
• Verify InsightsPanel shows categorized error on analysis failure
• Disable service worker (e.g. serve without HTTPS) — verify console shows [PWA] Service worker registration failed: with error details
• Verify no regressions in happy-path summarization flow

🤖 Generated with Claude Code

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