Fix weather icons, forecast temps, and update docs

- Replace emoji weather icons with OWM icon images to fix rendering
  issues on Linux displays (e.g. ⛅ showing as a rectangle)
- Fix forecast daily max/min to use true high/low across all 3-hour
  slots instead of just the first entry of the day
- Update README: correct BACKGROUND interval (60 min), update kiosk
  setup for labwc/Wayland, add restart-calendar.sh instructions

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

README.md

@@ -115,16 +115,10 @@ cp /path/to/your/images/*.jpg static/backgrounds/
 
 **Changing Image Rotation Interval:**
 
-Edit your `.env` file:
-```bash
-# Time in seconds (60 = 1 minute)
-IMAGE_ROTATION_INTERVAL=60
-```
-
-Or edit `static/js/app.js`:
+Edit `static/js/app.js`:
 ```javascript
 const INTERVALS = {
-    BACKGROUND: 60000,  // Milliseconds (60000 = 1 minute)
+    BACKGROUND: 3600000,  // Milliseconds (3600000 = 60 minutes)
     ...
 };
 ```
@@ -175,27 +169,21 @@ sudo systemctl start calendar-display.service
 
 ### Configure Chromium Kiosk Mode
 
-Edit the autostart file:
+The Pi uses **labwc** (Wayland). Create the autostart entry:
 
 ```bash
-mkdir -p ~/.config/lxsession/LXDE-pi
-nano ~/.config/lxsession/LXDE-pi/autostart
+mkdir -p ~/.config/autostart
+nano ~/.config/autostart/chromium-kiosk.desktop
 ```
 
-Add these lines:
+Add the following:
 
-```bash
-@xset s off
-@xset -dpms
-@xset s noblank
-@chromium-browser --kiosk --noerrdialogs --disable-infobars --disable-session-crashed-bubble http://localhost:5000
-```
-
-Disable screensaver and cursor (optional):
-
-```bash
-sudo apt-get install unclutter
-echo "@unclutter -idle 0" >> ~/.config/lxsession/LXDE-pi/autostart
+```ini
+[Desktop Entry]
+Type=Application
+Name=Chromium Kiosk
+Exec=chromium-browser --ozone-platform=wayland --kiosk --noerrdialogs --incognito --disable-infobars --simulate-touch-screen --force-show-cursor http://localhost:5002
+X-GNOME-Autostart-enabled=true
 ```
 
 ### Reboot
@@ -206,6 +194,18 @@ sudo reboot
 
 The display should now start automatically on boot!
 
+### Restarting Without Rebooting
+
+A helper script is included to restart both the Flask service and the Chromium kiosk without rebooting:
+
+```bash
+bash ~/restart-calendar.sh
+```
+
+This will:
+1. Restart the `calendar-display` systemd service
+2. Kill and relaunch Chromium in the correct Wayland session
+
 ## Configuration
 
 ### Environment Variables (`.env` file)
@@ -222,7 +222,6 @@ The display should now start automatically on boot!
 - `CALENDAR_DAYS_AHEAD` - Number of days ahead to show events (default: 5)
 
 **Update Intervals (in seconds):**
-- `IMAGE_ROTATION_INTERVAL` - Background image rotation (default: 60)
 - `WEATHER_UPDATE_INTERVAL` - Weather refresh interval (default: 900)
 - `CALENDAR_UPDATE_INTERVAL` - Calendar refresh interval (default: 300)
 - `JOKE_UPDATE_INTERVAL` - Dad joke refresh interval (default: 3600)
@@ -239,19 +238,18 @@ const INTERVALS = {
     TIME: 1000,              // 1 second
     WEATHER: 900000,         // 15 minutes
     CALENDAR: 300000,        // 5 minutes
-    BACKGROUND: 60000,       // 1 minute (change this for image rotation)
-    JOKE: 3600000           // 1 hour
+    BACKGROUND: 3600000,     // 60 minutes
+    JOKE: 3600000            // 1 hour
 };
 ```
 
 **To change image rotation time:**
 1. Open `static/js/app.js`
 2. Find the `INTERVALS` object at the top
-3. Change `BACKGROUND: 60000` to your desired value in milliseconds
-   - 30000 = 30 seconds
-   - 60000 = 1 minute
-   - 120000 = 2 minutes
+3. Change `BACKGROUND` to your desired value in milliseconds
    - 300000 = 5 minutes
+   - 1800000 = 30 minutes
+   - 3600000 = 60 minutes (default)
 
 ## Project Structure