refactor: remove 4-col outer margin from cat and TUI#8
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The MARGIN / MARGIN_WIDTH gutter originally mirrored glow's output. With TUI as the default mode it cost 4 cols of horizontal real estate for no remaining visual gain. Cat-mode table rows also lose their extra 2-col inset so all body content aligns at column 0. Hoist TOC_PANEL_WIDTH while in the area (was a magic 30 in three places). Snapshot fixtures regenerated; existing design docs get a dated "Update — 2026-05-22" appendix rather than in-place edits. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
MARGIN/MARGIN_WIDTH4-column outer indent that cat andTUI body rows shared (originally mirrored
glow). With TUI as thedefault mode it cost 4 cols of real estate for no remaining gain.
content now starts at column 0.
TOC_PANEL_WIDTHconstant insrc/tui/mod.rs(was a magic30literal in three places).wrap_and_write(drop the unusedsuffixparameter and thedead
term_width == 0guard) and inlineprefix_visual_width.Update — 2026-05-22section to three design docsthat referenced
MARGIN_WIDTH, without editing the historicalcontent.
Test plan
make checkpasses (fmt-check + clippy-D warnings+ 73 lib +9 CLI + 5 snapshot tests).
output — only the 4-col leading prefix removed and wrap points
shift later (extra usable width).
too close to the left edge and heading images still align with
body text at column 0 / column 30 (with ToC open).
🤖 Generated with Claude Code