umputun / revdiff / 24017808398

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Add color theme system with 5 bundled themes (#32)

* add plan: theme-support

* feat: add color theme system with bundled themes

Add theme package supporting INI-format color theme files with Parse,
Load, List, Dump, and InitBundled functions. Three bundled themes
included: dracula, nord, solarized-dark. Themes are auto-created in
~/.config/revdiff/themes/ on first run.

CLI integration via --theme, --dump-theme, --list-themes, --init-themes
flags. Theme application overwrites all 21 color fields plus chroma-style
via applyTheme() in main.go after parseArgs().

Related to #32

* move completed plan: 20260405-theme-support.md

* feat(ui): fill pane backgrounds for themed views and add catppuccin-mocha, gruvbox themes

- extend add/remove/modify line backgrounds to full pane width via extendLineBg
- fill pane interiors with DiffBg/TreeBg by stripping viewport padding and re-padding
  with bg-colored spaces via padContentBg
- set BorderBackground on pane borders to match pane background
- apply DiffBg to context lines and line numbers when set
- add LineContextHighlight style for syntax-highlighted context lines
- brighten nord theme add/remove/modify foreground and background colors
- add catppuccin-mocha and gruvbox bundled themes (5 total)
- document custom theme creation in README and plugin reference

* docs: update CLAUDE.md and plan to reflect 5 bundled themes and simplified precedence

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