feat(theme-selector): magit and elfeed bespoke previews (tier-3 phase 5)

I added renderMagitPreview and renderElfeedPreview. The magit one is a status buffer: head and branch lines, an untracked section, a diff hunk with context, removed, and added lines, and recent commits with hashes, authors, and a keyword and tag. The elfeed one is a search list: the filter line, dated entries with feed, unread and read titles, and tags, plus log lines colored by level. The preview pane dispatches to each app's bespoke renderer, the generic fallback covers everything else, and the pane label now names the app and says whether the preview is bespoke or generic.

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