feat: add markdown report export and improve desktop CSV paste workflow

[rad1092]

Motivation

• Provide an exportable, human-readable markdown summary of CSV analyses so results can be saved and shared using a simple CLI command (report).
• Improve the Windows desktop UX so users can analyze CSVs by pasting text when a file is not selected and auto-load opened files into the paste area.
• Keep streaming summarization behavior (small memory footprint / mixed-type handling) while exposing analysis outputs in both CLI and desktop flows.

Description

• Added build_markdown_report to bitnet_tools/analysis.py to render a markdown report with column info and numeric statistics.
• Added a report subcommand in bitnet_tools/cli.py that builds an analysis payload and writes a markdown report file via build_markdown_report.
• Enhanced the desktop UI (bitnet_tools/desktop.py) to include a CSV text input panel, auto-load file content into that panel when a CSV is opened, and accept either a selected file or pasted CSV text for analysis.
• Added a desktop entrypoint and helpers: bitnet_desktop.pyw, BitNet_Desktop_Start.bat, and bitnet-desktop script in pyproject.toml, updated README.md to document the new features, and added tests in tests/test_analysis.py and tests/test_cli.py for report generation and CLI behavior.

Testing

• Ran pytest -q and all tests passed (9 passed).
• Ran python -m bitnet_tools.cli --help and confirmed the new report subcommand appears in the usage output.
• Executed python -m bitnet_tools.cli report /tmp/sample.csv --question "요약" --out /tmp/r.md which saved a valid markdown report (inspected with head).
• A prior manual invocation against a non-existent path (tests/data.csv) raised FileNotFoundError as expected for missing input files.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep Tkinter widget access on the main thread

_analyze_async launches _analyze in a worker thread, but _analyze immediately reads Tk widgets via self.question.get(...) and self.csv_text.get(...); the same off-main-thread pattern is also used in _doctor/_run_model with self.model.get(...). Tkinter is not thread-safe, so these reads can intermittently raise Tcl errors or freeze/crash the desktop app when users click 분석/환경진단/BitNet 실행. Capture UI values on the main thread before starting the worker (or marshal reads via after) and keep background threads limited to non-UI work.

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