refactor(typing): clear the basedpyright warnings in the typecheck scope

[paddymul]

The typecheck job reports 6 warnings on main, and they show up as annotations on any PR that touches these files. This clears them.

• kls → cls as the first parameter of five classmethods: PdSampling.pre_stats_sample, ServerSampling.pre_stats_sample, the post_process_df that add_processing generates in buckaroo_widget.py and xorq_buckaroo.py, and DefaultMainStyling.style_column. customizations/styling.py isn't in the typecheck scope on main, but typing: give init_sd's display config keys a type, type-check the styling files #980 adds it. All five are called positionally, so callers aren't affected.
• InnerDataFlow._df_to_obj took idfself so its body could reach the widget's self. The widget is now bound to widget before the class statement, and the method takes a plain self.
• get_story_config(include_summary_stats=True) raises NotImplementedError instead of dividing by zero. Nothing calls it with True.

Test

• basedpyright 1.39.8 on pyrightconfig.typecheck.json: 0 errors, 0 warnings (main: 0 errors, 6 warnings)
• pytest tests/unit: 1274 passed, 6 skipped
• ruff and paddy_format clean

🤖 Generated with Claude Code

[github-actions]

📦 TestPyPI package published

pip install --index-strategy unsafe-best-match --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple/ buckaroo==0.15.6.dev36147622075

or with uv:

uv pip install --index-strategy unsafe-best-match --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple/ buckaroo==0.15.6.dev36147622075

MCP server for Claude Code

claude mcp add buckaroo-table -- uvx --from "buckaroo[mcp]==0.15.6.dev36147622075" --index-strategy unsafe-best-match --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple/ buckaroo-table

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