feat(theme-studio): swatch dropdowns, lock toggles, palette seeding

The design session added a batch of tool features. They landed together in the page generator, so this commits them as one.

A custom swatch color dropdown replaces the native select in the syntax table, showing a color square, name, and hex per row, because native option backgrounds render unreliably on Linux Chrome.

THEME_STUDIO_SEED=<file.json> seeds the tool's starting palette, assignments, bold, italic, and UI from a theme.json at generate time, so opening the tool on a given palette is one regenerate with no import step.

Lock toggles sit on all three tables. A closed lock marks a decided element/color pairing and disables that row's editing controls. Clear-unlocked resets the rest to default and leaves the locked rows alone. Locks persist in the saved theme, with keys namespaced (bare syntax, ui:, pkg:) so the tiers don't collide.

The UI faces table gained a contrast column, and the three tables now share one column order: name, lock, color, style, contrast. The bg and fg rows are renamed to "bg (ground)" and "fg".

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