feat: add Atlas native app UX overhaul

Docs/ROADMAP.md

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+# MVP Roadmap
+
+## Timeline
+
+### Week 1
+
+- Freeze MVP scope
+- Freeze naming, compliance, and acknowledgement strategy
+- Freeze product goals and success metrics
+
+### Week 2
+
+- Freeze IA and high-fidelity design input for key screens
+- Freeze interaction states and permission explainers
+
+### Week 3
+
+- Freeze architecture, protocol, state machine, and helper boundaries
+
+### Week 4
+
+- Create engineering scaffold and mock-data application shell
+
+### Week 5
+
+- Ship scan initiation and result pipeline
+
+### Week 6
+
+- Ship action-plan preview and cleanup execution path
+
+### Week 7
+
+- Ship apps list and uninstall preview flow
+
+### Week 8
+
+- Ship permissions center, history, and recovery views
+
+### Week 9
+
+- Integrate privileged helper path and audit trail
+
+### Week 10
+
+- Run quality, regression, and performance hardening
+
+### Week 11
+
+- Produce beta candidate and packaging pipeline
+
+### Week 12
+
+- Internal beta wrap-up and release-readiness review
+
+## MVP Scope
+
+- In scope: `Overview`, `Smart Clean`, `Apps`, `History`, `Recovery`, `Permissions`
+- Deferred to P1: `Storage treemap`, `Menu Bar`, `Automation`