Launcher Polish — Phase 3: Sidebar Geometry Overhaul

[Emperiusm]

Task

Implement Phase 3 — Sidebar Geometry Overhaul from the launcher UI polish plan.

Plan Reference

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

Read the plan's Phase 3 section. Phases 0–2 are already merged. GlassQuad now has a Default impl (Phase 0 TASK-P05a), so ..Default::default() shorthand is available.

Tasks (7)

Task	Summary
TASK-008	Move sidebar origin to (0, 0), set corner_radius: 0.0
TASK-009	Extend sidebar height to full window height
TASK-010	Remove sidebar horizontal margin/padding
TASK-011	Adjust content area x offset to account for flush sidebar
TASK-012a	Restyle active nav item — flush rect + 4px PRIMARY_BLUE left bar
TASK-012b	Replace sidebar branding with hamburger icon (conditional on Phase 5)
TASK-015	Adjust nav item vertical spacing and padding

Constraints

• After each task, run cargo check -p prism-client.
• After all tasks, run cargo test --workspace.
• Update the Progress Tracker: check off Phase 3. If Phases 1–3 are all done, also check off Pass 1.
• Single commit: feat(client): Phase 3 — sidebar geometry overhaul
• Branch: launcher-polish/phase-3
• Do NOT modify files outside crates/prism-client/.

Labels

launcher-polish, phase-3, pass-1