feat: add browser console logging to dashboard

[nicholaspsmith]

Summary

Add console logging to help debug indexing issues:

• Colored log utility with info/warn/error/event levels
• Log all SSE events (connected, progress, start, complete, status)
• Log API fetch requests with timing
• Helps identify where things are hanging

Open browser dev tools (F12) → Console to see the logs.

Example output:

[lance-context] Dashboard initialized
[lance-context] Connecting to SSE...
[lance-context] SSE: connected
[lance-context] Fetching dashboard data...
[lance-context] API requests completed in 45ms
[lance-context] Status loaded {indexed: true, fileCount: 100, ...}
[lance-context] SSE: indexing:progress {phase: "embedding", current: 1000, total: 52016}

Test plan

• Open dashboard and browser dev tools
• Verify logs appear in console
• Start indexing and verify progress events are logged

🤖 Generated with Claude Code

[github-actions]

🎉 This PR is included in version 1.20.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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