feat(ui): phase 1 quick/advanced UI, improved numeric parsing, and offline bundle tooling

[rad1092]

Motivation

• Make the UI approachable for first-time users by exposing a minimal "빠른 시작" path and hiding advanced controls by default, as Phase 1 of the UI simplification plan.
• Increase robustness of numeric detection to handle common human-entered formats (commas, currency symbols, percent signs, and parentheses for negatives).
• Add tooling and documentation to support reproducible offline bundling and online resource collection for future phases and deployments.

Description

• Implemented a simplified Phase 1 web UI with a quick/advanced mode split and unified status feedback in bitnet_tools/ui/index.html, bitnet_tools/ui/app.js, and bitnet_tools/ui/styles.css, with advanced panels hidden by default.
• Hardened numeric parsing in bitnet_tools.analysis._to_float to normalize/remove commas, currency symbols, percent signs and interpret parentheses as negative values.
• Added offline/online support artifacts and scripts including scripts/prepare_online_bundle.sh, scripts/collect_online_assets.py, resources/online_sources.json, and documentation files NEXT_STEPS_UI_AND_BACKLOG.md, BASELINE_PLAN.md, ONLINE_EXECUTION_LOG.md, ONLINE_RESOURCE_COLLECTION.md, and REVIEW_REPORT.md.
• Added CSV fixtures and expanded tests in tests/test_analysis.py to validate the new numeric parsing and baseline summaries, and included UI smoke artifacts captured during validation.

Testing

• Ran pytest -q and all tests passed (26 passed).

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid double-negating parenthesized values

When _to_float sees parentheses it always negates the parsed value, so an input like (-99.1) is normalized to -99.1 and then flipped to +99.1. This silently corrupts numeric summaries for datasets that already include an explicit minus sign inside parentheses (a common export quirk), because those rows are now treated as positive instead of negative.

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