Responsive main menu added, AGENTS updated.

AGENTS.md

@@ -214,9 +214,10 @@ labhelper/
 │   │       ├── add_things.html             # Form to add multiple things
 │   │       ├── box_detail.html             # Box contents view
 │   │       ├── box_management.html         # Box/BoxType CRUD management
+│   │       ├── edit_thing.html            # Edit thing page (name, description, picture, tags, files, links)
 │   │       ├── index.html                  # Home page with boxes and tags
 │   │       ├── search.html                 # Search page with AJAX
-│   │       └── thing_detail.html           # Thing details view with tags
+│   │       └── thing_detail.html           # Read-only thing details view
 │   ├── templatetags/
 │   │   └── dict_extras.py                  # Custom template filters: get_item, render_markdown, truncate_markdown
 │   ├── admin.py                            # Admin configuration
@@ -350,6 +351,7 @@ The project uses a base template system at `labhelper/templates/base.html`. All
 - Grid layouts with `repeat(auto-fill, minmax(250px, 1fr))`
 - Flexbox for component layouts
 - Breakpoints handled by grid and flex-wrap
+- **Navigation**: Responsive navbar with hamburger menu on mobile (≤768px) and full horizontal menu on desktop (≥769px)
 
 ### CSS Guidelines
 
@@ -384,7 +386,8 @@ The project uses a base template system at `labhelper/templates/base.html`. All
 | `edit_box` | `/box/<str:box_id>/edit/` | `edit_box` | Edit box |
 | `delete_box` | `/box/<str:box_id>/delete/` | `delete_box` | Delete box |
 | `box_detail` | `/box/<str:box_id>/` | `box_detail` | View box contents |
-| `thing_detail` | `/thing/<int:thing_id>/` | `thing_detail` | View/edit thing (move, picture, files, links, tags) |
+| `thing_detail` | `/thing/<int:thing_id>/` | `thing_detail` | Read-only view of thing details |
+| `edit_thing` | `/thing/<int:thing_id>/edit/` | `edit_thing` | Edit thing (name, description, picture, tags, files, links, move) |
 | `add_things` | `/box/<str:box_id>/add/` | `add_things` | Add multiple things to a box |
 | `search` | `/search/` | `search` | Search page |
 | `search_api` | `/search/api/` | `search_api` | AJAX search endpoint |
@@ -482,7 +485,7 @@ The `Thing.description` field supports Markdown formatting with HTML sanitizatio
 
 | Form | Model | Purpose |
 |------|-------|---------|
-| `ThingForm` | Thing | Add/edit a thing (name, description, picture, tags) |
+| `ThingForm` | Thing | Add/edit a thing (name, description, picture) - tags managed separately |
 | `ThingPictureForm` | Thing | Upload/change thing picture only |
 | `ThingFileForm` | ThingFile | Add file attachment |
 | `ThingLinkForm` | ThingLink | Add link |
@@ -547,6 +550,7 @@ Per `.gitignore`:
 5. **Templates in labhelper/templates/**: The base template and shared templates are in `labhelper/templates/`. App-specific templates remain in `app_name/templates/`.
 6. **Use get_object_or_404** instead of bare `.get()` calls
 7. **Never commit SECRET_KEY** - use environment variables in production
+8. **Be careful with process management**: Avoid blanket kills on ports (e.g., `lsof -ti:8000 | xargs kill -9`) as they can kill unintended processes like web browsers. Use specific process kills instead: `pkill -f "process_name"`
 
 ## Deployment Commands