refactor(ui): color the cursor and modeline from theme faces, in sync

The cursor color and the modeline buffer-name indicator both hard-coded hex colors through cj/buffer-status-colors. Replaced that constant with cj/buffer-status-faces, mapping each buffer state to a theme face: read-only to error, overwrite and modified to warning, unmodified to success. A shared classifier (cj/buffer-status-state) and resolver (cj/buffer-status-color) in user-constants now drive both consumers, so the cursor and the modeline resolve their color from the active theme at use time and stay in sync, including the ghostel-terminal case the cursor already special-cased. Tests cover the map, the classifier, the resolver, and both integration paths.

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