Implement Step 1 UI simplification and quick-start guidance

[rad1092]

Motivation

• Improve first-run experience by making the quick-start flow explicit and reducing friction to run an initial analysis.
• Provide in-context guidance for both quick and advanced modes so users immediately see the recommended steps.
• Improve accessibility and discoverability of status/guide updates via aria-live regions and clearer status text.

Description

• Added an inline mode guide element (<ol id="modeGuide" class="quick-guide">) to bitnet_tools/ui/index.html and marked status/guide regions with aria-live for accessibility.
• Implemented renderModeGuide(mode) in bitnet_tools/ui/app.js, wired modeGuide into the page, updated setMode to refresh the guide and adjusted quick/advanced status text.
• Made chip interactions focus the 바로 분석 button after filling the question to speed the quick-run path in bitnet_tools/ui/app.js.
• Added styling for the guide list in bitnet_tools/ui/styles.css and committed the changes with the message Implement step 1 quick-start UI guidance improvements.

Testing

• Ran the test suite with pytest -q and all tests passed (26 passed).
• Launched the UI with python -m bitnet_tools.cli ui --host 0.0.0.0 --port 8765 and validated the page loads successfully.
• Captured an automated Playwright screenshot of the updated UI (artifacts/ui-step1.png) to verify the rendered guide and status updates.

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Codex Task