feat: add Atlas native app UX overhaul

Docs/IA.md

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+# Information Architecture
+
+## Primary Navigation
+
+- `Overview`
+- `Smart Clean`
+- `Apps`
+- `History`
+- `Permissions`
+- `Settings`
+
+## MVP Navigation Notes
+
+- `History` contains recovery entry points.
+- `Settings` contains acknowledgements and third-party notices.
+- `Storage` remains scaffolded at the package layer but is not part of the frozen MVP app shell.
+
+## Screen Responsibilities
+
+### Overview
+
+- Health summary
+- Reclaimable space summary
+- Top issues
+- Recommended actions
+- Recent activity
+
+### Smart Clean
+
+- Scan initiation
+- Findings grouped by `Safe`, `Review`, `Advanced`
+- Selection and preview
+- Execution and result summary
+
+### Apps
+
+- Installed app list
+- Footprint details
+- Leftovers and background item visibility
+- Uninstall preview and execution
+
+### History
+
+- Timeline of runs
+- Task detail view
+- Recovery item access
+
+### Permissions
+
+- Permission status cards
+- Guidance and system-settings links
+
+### Settings
+
+- General preferences
+- App language
+- Rules and exclusions
+- Recovery retention
+- Notifications
+- Acknowledgements
+
+## Global Surfaces
+
+- Toolbar search
+- Task center
+- Confirmation sheets
+- Error detail sheet
+- Permission explainer sheet