feat: add Atlas native app UX overhaul

Docs/PRD.md

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+# PRD
+
+## Product
+
+- Working name: `Atlas for Mac`
+- Category: `Mac Maintenance Workspace`
+- Target platform: `macOS`
+
+## Positioning
+
+Atlas for Mac is a native desktop maintenance application that helps users understand why their Mac is slow, full, or disorganized, then take safe and explainable action.
+
+## Product Goals
+
+- Help users complete a safe space-recovery decision in minutes.
+- Turn scanning into an explainable action plan.
+- Unify cleanup, uninstall, permissions, history, and recovery into one workflow.
+- Prefer reversible actions over permanent deletion.
+- Support heavy Mac users and developer-oriented cleanup scenarios.
+
+## Non-Goals
+
+- No anti-malware suite in MVP.
+- No Mac App Store release in MVP.
+- No full automation rule engine in MVP.
+- No advanced storage treemap in MVP.
+- No menu bar utility in MVP.
+
+## Target Users
+
+- Heavy Mac users with persistent disk pressure.
+- Developers with Xcode, simulators, containers, package-manager caches, and build artifacts.
+- Creative users with large local media libraries.
+- Cautious mainstream users who want safer maintenance than terminal tools.
+
+## MVP Modules
+
+- `Overview`
+- `Smart Clean`
+- `Apps`
+- `History`
+- `Recovery`
+- `Permissions`
+- `Settings`
+
+## Core Differentiators
+
+- Explainable cleanup recommendations
+- Recovery-first execution model
+- Unified maintenance workflow
+- Developer-aware cleanup coverage
+- Least-privilege permission design
+
+## Success Metrics
+
+- First scan completion rate
+- Scan-to-execution conversion rate
+- Permission completion rate
+- Recovery success rate
+- Task success rate
+- User-visible space reclaimed
+
+## MVP Acceptance Summary
+
+- Users can run a scan without granting all permissions up front.
+- Findings are grouped by risk and explained before execution.
+- Users can preview app uninstall footprint before removal.
+- Every destructive task produces a history record.
+- Recoverable actions expose a restoration path.
+- The app includes a visible open-source acknowledgement and third-party notices page.