Simplify analyzer UI to single-input, core-result flow

[rad1092]

Motivation

• Reduce cognitive load by making the default UI focused on a single request input, one execute action, and a single core result card.
• Keep advanced debug and file/advanced features available but hidden by default to avoid clutter and preserve backward-compatible element IDs for existing logic and tests.
• Expose the generated prompt/code only when the user explicitly requests it via a recognizable phrase (코드도 보여줘).

Description

• Reworked bitnet_tools/ui/index.html to present a single primary textarea#question, a single #quickAnalyzeBtn and a focused result card (#summary), moved file/csv controls into a collapsed <details> section, and placed advanced debug outputs inside collapsed details.
• Updated bitnet_tools/ui/app.js to add UI.rawJson and UI.codeDetails references, added CODE_REQUEST_PATTERN, shouldShowCodeBlock, formatCoreSummary, and renderPrimaryResult helpers, and wired analyze flow to render only the concise core result by default while showing the prompt block conditionally.
• Adjusted bitnet_tools/ui/styles.css to style the simplified panel and result card (.simple-panel, .result-card) and slightly widen the container for the new layout.
• Preserved advanced element IDs and a hidden advanced-only section so existing APIs and tests keep working.

Testing

• Ran pytest -q tests/test_ui_contract.py tests/test_web.py and all tests passed (17 passed).
• Executed an automated Playwright script to load the UI and capture a screenshot (artifacts/simple-ui.png), which ran successfully.

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[chatgpt-codex-connector]

Remove permanent hidden flag from advanced controls section

The new <section class="advanced-only" hidden> makes all advanced controls permanently non-rendered, because setMode in app.js only toggles style.display for .advanced-only elements and never clears the hidden attribute. In this commit, that hidden section now contains both mode-toggle buttons and the multi/dashboard/geo inputs, so users cannot enter advanced mode or supply inputs required by multi/visualize flows from the UI.

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