docs: Add GitHub response template for spaces in device name issue

docs/github-response-spaces-in-device-name.md

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+# GitHub Issue Response: Spaces in MC_DEVICE_NAME
+
+**Issue:** User @remowashere reported that the application fails when `MC_DEVICE_NAME` contains spaces (e.g., "Remo WebUI"), resulting in "file not found" errors for `.msgs` files.
+
+---
+
+Hi @remowashere,
+
+Thanks for reporting this issue! I've investigated the problem with spaces in `MC_DEVICE_NAME` and did some testing.
+
+**Good news:** The current version of mc-webui (on both `dev` and `main` branches) handles spaces in device names correctly. I tested with `MC_DEVICE_NAME="MarWoj Test"` and the application successfully reads the `.msgs` file without any issues:
+
+```
+mc-webui | INFO - Loaded 1 messages from /root/.config/meshcore/MarWoj Test.msgs
+```
+
+The application uses Python's `pathlib.Path` for file operations, which properly handles spaces and special characters in filenames.
+
+## Possible causes of your issue
+
+1. **Outdated version** - You might be running an older version of the application
+2. **meshcore-cli version** - Older versions of meshcore-cli might have had issues creating files with spaces
+3. **Configuration issue** - The `MC_DEVICE_NAME` environment variable might not match the actual device name used by meshcore-cli
+4. **File permissions** - The `.msgs` file might not have been created yet or lacks proper permissions
+
+## Recommended steps
+
+### 1. Update to the latest version
+
+```bash
+cd ~/mc-webui
+git pull origin main
+docker compose down
+docker compose up -d --build
+```
+
+### 2. Verify your configuration
+
+```bash
+# Check your .env file
+cat .env | grep MC_DEVICE_NAME
+
+# List actual .msgs files
+ls -la ~/.config/meshcore/*.msgs
+```
+
+**Important:** Make sure the value of `MC_DEVICE_NAME` in your `.env` file matches the device name configured in meshcore-cli. The `.msgs` file is created by meshcore-cli using the device name you configured on the device itself.
+
+### 3. Check logs for more details
+
+```bash
+docker compose logs -f mc-webui | grep -i "messages file"
+```
+
+Look for log lines indicating which file path the application is trying to access and whether it exists.
+
+### 4. Verify meshcore-cli version
+
+The application requires meshcore-cli >= 1.3.12. The Docker container installs the latest version automatically, but if you're running an older version, please update.
+
+## Additional troubleshooting
+
+If you're still experiencing issues after updating, please share:
+
+1. **Docker logs:**
+   ```bash
+   docker compose logs --tail=100 mc-webui
+   docker compose logs --tail=100 meshcore-bridge
+   ```
+
+2. **Git version:**
+   ```bash
+   git log -1 --oneline
+   ```
+
+3. **Environment configuration** (with sensitive data redacted):
+   ```bash
+   cat .env
+   ```
+
+4. **Actual .msgs files on disk:**
+   ```bash
+   ls -la ~/.config/meshcore/ | grep .msgs
+   ```
+
+This information will help me understand exactly what's happening in your environment.
+
+Let me know if updating resolves the issue!
+
+Best regards,
+Marek