Unify app button system

[Cyber-preacher]

Why

Buttons had drifted across the app through raw native controls, local typography and sizing overrides, and a global font reset that rendered native buttons differently from linked buttons. The mismatch was especially visible in the top-right actions on Draft cards.

Changes

• Expand the shared Button primitive with canonical destructive, bare, icon, toolbar, and content variants.
• Route every native button and simulated button role through the shared primitive.
• Remove local font, opacity, height, radius, and padding overrides where the primitive owns presentation.
• Align Draft visibility actions with the other Draft card controls.
• Fix mobile action wrapping in faction creation and Vortexopedia rows.
• Add a source-wide regression guard against raw buttons and an end-to-end computed-style check for Draft actions.

Validation

• yarn test: 243 tests passed across 55 files
• yarn typecheck
• yarn build
• yarn prettier:check
• yarn test:e2e: 121 tests passed
• Desktop and 390px browser audits across app routes
• git diff --check