feat(cli): add dark/light theme toggle to local preview - #92
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Match the hosted viewer: pill switch in a top-right chrome cluster instead of a labeled button under the TOC.
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Summary
file://one-shot and--watch/ runner on127.0.0.1:7821) so it stays visually in lockstep with the hosted viewer.<head>(html[data-theme]) before first paint. Preference lives inlocalStorage['gander-theme']("light"|"dark"); absence follows the OS.try/catcharoundlocalStoragecovers Safarifile://SecurityError.aria-pressed. Desktop-with-TOC: under the logo. No-TOC / mobile: left-aligned.gander-md-toolbar. Both sit outside#content-bodyso watch reloads do not eat them.@10nowinitializes withdark/default, stashes source ondata-gander-mermaid, and serializes overlappingrun()on an in-flight Promise. Logo SVG usesfill="currentColor". Light palette is unchanged (bodyuses--gander-bg).Related Issue
Closes #91
Paired with the hosted viewer (visual contract, not API): gandermd/gandermd#55.
Testing
go test ./...go vet ./...go build ./...CGO_ENABLED=0 go build -o gander .Notes
Token table, boot, and toggle scripts are a copy of gandermd
internal/render/theme.go(no shared Go module). Persistence does not crossfile://,127.0.0.1:7821, andhttps://gander.md— acceptable per the design. A slipped CLI release does not block server deploy.