docs: add UI screenshots to migration guide and device setup (#159)

Copy 5 screenshots from _/screenshots/ into docs/images/ and wire them
into the migration guide (Settings, Devices, Sync, Migration tabs) and
the device initial setup guide (speaker AP mode Wi-Fi page). Replace the
images README wishlist with a table of what is actually present.

Also correct the AP mode IP address (192.0.2.1, verified on ST10) and
update the Settings step to match actual UI labels (Target Domain, DNS
Bind Address).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/images/README.md

@@ -1,90 +1,17 @@
-# Images for Migration Guide
+# docs/images
 
-This directory contains images, screenshots, and diagrams referenced in the migration guide and other documentation.
+Screenshots and diagrams referenced by the documentation.
 
-## Required Images for Migration Guide
+## Current screenshots
 
-The following images need to be created to complete the migration guide:
+| File | Shows | Used in |
+|------|-------|---------|
+| `ui-settings.png` | AfterTouch web UI — Settings tab (Target Domain, DNS Discovery, Mirroring) | Migration Guide |
+| `ui-devices.png` | AfterTouch web UI — Devices tab (discovered speakers with Sync/Migrate actions) | Migration Guide |
+| `ui-sync.png` | AfterTouch web UI — Data Sync tab (successful sync result) | Migration Guide |
+| `ui-migration.png` | AfterTouch web UI — Migration tab (HTTPS test, DNS test, method selector) | Migration Guide |
+| `speaker-ap-wifi-setup.png` | Speaker AP mode Wi-Fi setup page at `http://192.0.2.1` | Device Initial Setup |
 
-### Dashboard Screenshots
-- **dashboard-home.png** - Main SoundTouch Service dashboard homepage
-- **account-creation.png** - Account creation form with fields filled
-- **account-dashboard.png** - Fresh account dashboard showing ready state
-- **device-discovery.png** - Device discovery page showing found speakers
-- **device-registration.png** - Device registration dialog with options
-- **migration-setup.png** - Migration configuration dialog
-- **migration-progress.png** - Migration progress tracker showing phases
-- **migration-health.png** - Migration health monitoring dashboard
-- **account-migration.png** - Account-wide migration progress overview
-- **migration-complete.png** - Completed migration dashboard view
-- **backup-setup.png** - Backup configuration settings page
+## Adding new screenshots
 
-### Setup and Preparation
-- **usb-remote-services.png** - USB drive setup showing file structure
-- **raspberry-pi-setup.png** - Raspberry Pi with connected cables (optional)
-
-### Process Diagrams
-- **migration-flow-diagram.png** - Flow chart showing migration phases
-- **network-topology.png** - Network diagram showing Pi, router, speakers
-- **data-flow-diagram.png** - How data flows between components
-
-## Image Requirements
-
-### Technical Specifications
-- **Format**: PNG preferred for screenshots, SVG for diagrams
-- **Resolution**: Minimum 1200px width for screenshots
-- **File Size**: Keep under 500KB when possible for fast loading
-- **Naming**: Use descriptive kebab-case names as shown above
-
-### Content Guidelines
-- **Clean Interface**: Show realistic but clean interface states
-- **Consistent Styling**: Use consistent colors and styling across images
-- **Readable Text**: Ensure all text in screenshots is legible
-- **Example Data**: Use realistic example data (Living Room Speaker, etc.)
-- **Status Indicators**: Show clear success/error states with appropriate colors
-
-### Placeholder Content
-Until real screenshots are available, consider:
-- **Mockups**: Create simple mockups showing the expected interface
-- **Wireframes**: Basic wireframes indicating layout and content
-- **Diagrams**: Technical diagrams can be created immediately
-- **Text Placeholders**: Use `[Image: Description]` in documentation
-
-## Creating the Images
-
-### For Dashboard Screenshots
-1. Set up the enhanced SoundTouch service
-2. Create sample account and register devices
-3. Take screenshots at key points in the migration process
-4. Edit for clarity (highlight important elements, add annotations)
-
-### For Diagrams
-1. Use tools like Lucidchart, draw.io, or similar
-2. Follow consistent color scheme:
-   - Blue: SoundTouch Service components
-   - Green: Healthy/successful states
-   - Orange: Warning/in-progress states
-   - Red: Error/problematic states
-   - Gray: External/third-party components
-
-### For Physical Setup
-1. Take photos of actual hardware setup
-2. Show USB drive preparation process
-3. Demonstrate network connections if helpful
-
-## Alternative Text Requirements
-
-Each image should have appropriate alt text for accessibility:
-
-```markdown
-![Alt text describing the image content](../images/image-name.png)
-*Caption: Additional context or explanation*
-```
-
-## Future Enhancements
-
-Consider adding:
-- **Video Walkthroughs**: Screen recordings of key processes
-- **Interactive Demos**: Web-based interactive guides
-- **Troubleshooting Screenshots**: Common error states and solutions
-- **Mobile Views**: How to access from mobile devices
+PNG format, 1200 px or wider. Use descriptive kebab-case names. Update this README when adding files.