fix: add error handling for search worker initialization and fix transcription highlighting

[Copilot]

Addresses review feedback from PR #4 to prevent unhandled promise rejections and fix transcription search highlighting.

Changes

• ChatView.svelte: Pass searchQuery unconditionally to MessageBubble instead of empty string when message content doesn't match

  • Fixes transcription highlighting which checks searchQuery.trim() and returns false for empty strings

• state.svelte.ts: Wrap ensureSearchWorker() in try-catch to handle worker initialization failures

  • Sets isSearching = false and searchProgress = 0 on error
  • Prevents unhandled promise rejection when worker fails to load or times out

// Before
await ensureSearchWorker(chat);

// After
try {
  await ensureSearchWorker(chat);
} catch (error) {
  console.error('Failed to initialize search worker:', error);
  isSearching = false;
  searchProgress = 0;
  return;
}

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