fix(palette): emit the rofi palette from roles, not scheme colour names

Switching to tokyo-night broke every rofi launcher. The themes reference
Catppuccin spellings (@base, @text, @surface0), and gen_rofi emitted whatever
names the scheme happened to use, so under Tokyo Night the palette defined bg
and fg instead and rofi refused to parse a theme referencing colours that did
not exist.

The names the themes ask for are now filled from roles, the same way every
other consumer already worked. The spellings stay Catppuccin's because that is
what the themes were written against; only the values change per scheme.

Adds a selftest that collects every @name used in a colour property across the
themes and asserts the generator emits it. Verified it fails when a name is
removed, rather than passing vacuously, and all seven themes now parse under
all four schemes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015gbjA2bmswN8jyPDKzrvqe

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