Show binary columns as a stub instead of reading their blobs#48
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Binary columns (e.g. raw document bytes) are often large. Materializing them into the display buffer is what made jump-to-end and scrolling stall on big datasets — reading ~GBs of blobs just to render a preview the grid truncates anyway (measured: a 64-row end slice of the EDGAR hive set was ~78 MB / 5 min cold; the same slice with the binary column projected out is ~4 s). The display buffer now replaces binary columns with a "‹binary›" stub literal, so polars never reads those column pages. The column still appears in its place (header + stub cells), and the real bytes remain available via `lf` for export and analysis (export collects from `lf`, not the display buffer). A bonus: small columns previously hidden behind a wide binary column now fit on screen. Adds a test asserting the buffer holds the stub, not binary data.
Binary columns show the ‹binary› placeholder; style those cells with a dedicated color (default dark gray) plus italic so they read as a placeholder rather than data. The color is themeable via a new binary_col config key alongside the existing column-type colors, and is applied independently of the column_colors toggle since the stub is never real data.
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Render binary (blob) columns in the data table as a distinct dim-italic placeholder (`‹binary›`) instead of reading their bytes into the display buffer. Reading large blobs (e.g. raw document bytes across many partitions) is what stalled scrolling and jump-to-end; the buffer now holds a stub while the real bytes remain in `lf` for export.
Includes a `binary_col` style config key and documentation.
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