umputun / revdiff / 28144801821

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Add automatic light/dark theme selection (#237)

* Add automatic light/dark theme selection

Add a new special theme called `auto` and two new config flags:
`auto-theme-light` and `auto-theme-dark`.

If `theme = auto`, resolve to either the light or dark theme depending
on the terminal background color.

Defaults:
- auto-dark-theme: revdiff
- auto-light-theme: catppuccin-latte

* docs: sync auto-theme flags to claude-plugin reference and site docs

the PR added --auto-theme-dark/--auto-theme-light to README and the codex skill reference but missed the .claude-plugin reference copy (kept byte-identical) and site/docs.html (kept in sync with README).

* fix(themes): extract resolveThemeName to keep handleThemes under gocyclo limit

the auto-theme branch pushed handleThemes cyclomatic complexity to 21 (>20). move the "auto" sentinel dispatch into resolveThemeName so handleThemes stays at 20. behavior unchanged - termenv is queried only when theme=auto.

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Co-authored-by: Umputun <umputun@gmail.com>

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