Launcher Polish — Phase 2: Primary Button Color Fix

[Emperiusm]

Task

Implement Phase 2 — Primary Button Color Fix from the launcher UI polish plan.

Plan Reference

docs/superpowers/plans/2026-04-03-launcher-ui-polish.md

Read the plan's Phase 2 section. Phases 0–1 are already merged.

Tasks (3)

Task	Summary
TASK-005	Audit Button::paint() — verify ColorMode::Light + Primary uses PRIMARY_BLUE
TASK-006	Verify secondary/ghost button styles match design
TASK-007	Center-align button label text using text_width()

Constraints

• After each task, run cargo check -p prism-client.
• After all tasks, run cargo test --workspace.
• Update the Progress Tracker: check off Phase 2.
• Single commit: feat(client): Phase 2 — primary button color fix
• Branch: launcher-polish/phase-2
• Do NOT modify files outside crates/prism-client/.

Labels

launcher-polish, phase-2, pass-1