feat(theme-studio): inline height control on the exposed face rows

A new size column in the UI and package tables carries one numeric field plus an abs/rel toggle, exposed per the editable-height spec: chrome faces (mode-line family, line-number family, and header-line/tab-bar/tab-line when they arrive) default to absolute 1/10pt entry with a computed pt hint; the seeded heading faces (org-level-*, document title/info, agenda structure/dates, shr headings, and friends) default to a relative multiplier. Any other face carrying a live height exposes the control dynamically; the long tail gets none.

Absolute entry takes a positive integer only; relative entry clamps into the 0.1-2.0 range the old field used; garbage never reaches the model. The toggle writes heightMode explicitly and clears the number on a flip, since 130 tenth-points and 1.3x mean different things. The kind-unaware height field in the row expander is retired, and a non-default height now marks the size cell instead of the expander toggle.

The seeded set is named statically in app-core.js because the per-row default comes from the captured Emacs snapshot, which carries no heights for those faces. The #preview screenshot hash now accepts @ui/@code view keys so the harness can shoot the UI table.

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