🖼️ Issue: Add Feature Screenshots with Mock Data

### 📝 Description
Create visual documentation for the app by capturing screenshots of key features.
Mock data should be used to illustrate functionality without exposing real user information.

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### ✅ Tasks
- [ ] Capture screenshots of main screens (dashboard, scan results, encryption status).
- [ ] Include screenshots of WiFi/Bluetooth scan results with mock GPS data.
- [ ] Add screenshots of import/export flows with encrypted/unencrypted databases.
- [ ] Capture dialogs for passphrase setup, unlock, and encryption settings.
- [ ] Use consistent styling and highlight key features in the images.
- [ ] Annotate screenshots if needed to explain functionality.
- [ ] Save images in `docs/screenshots/` and link them in README and Quickstart guides.

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### 🧾 Notes
- Ensure no real user or sensitive data is visible.
- Mock data should resemble real app output to demonstrate features accurately.
- Include screenshots for both encrypted and unencrypted workflows where relevant.

Start by reviewing the README and Quickstart guides and identify the app screens covering the dashboard, scan results, encryption, import/export, and passphrase flows. Use mock data only, save the resulting images in docs/screenshots/, and link them from both guides. Done means the requested encrypted and unencrypted workflows are represented consistently without real or sensitive data.

Written by the indexing model from the issue text.