feat(theme-selector): package-faces table UI (tier-3 phase 3)

I added the package faces section: an application selector for org-mode, magit, and elfeed, and a face table for the chosen app with a foreground and background dropdown, bold and italic toggles, an inherit dropdown (base faces plus the app's own faces), a relative-height stepper, a live contrast readout on the effective inherit-resolved color, and a per-face reset, plus a per-app reset and a text filter for the large sets.

The right pane shows a generic preview, each face name in its own resolved colors, which the bespoke org/magit/elfeed previews replace in the next phases. The fg/bg dropdown is now a shared colorDropdown helper that the ui-faces table also uses, so there's no forked control. Palette edits propagate to package faces, and import and export carry them through.

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