feat: Add timezone configuration for Docker to ensure correct time handling in production and development environments

DEPLOYMENT_TIMEZONE_FIX.md

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+# Quick Deployment Guide - Timezone Fix
+
+## For Production Server
+
+1. **SSH into your server** where Docker is running
+
+2. **Navigate to project directory**
+   ```bash
+   cd /path/to/panel
+   ```
+
+3. **Pull latest code** (includes timezone fixes)
+   ```bash
+   git pull origin main
+   ```
+
+4. **Stop running containers**
+   ```bash
+   docker-compose -f docker-compose.prod.yml down
+   ```
+
+5. **Rebuild Docker images** (this is critical - it bakes in the timezone configuration)
+   ```bash
+   docker-compose -f docker-compose.prod.yml build --no-cache
+   ```
+
+6. **Start containers**
+   ```bash
+   docker-compose -f docker-compose.prod.yml up -d
+   ```
+
+7. **Verify timezone is correct**
+   ```bash
+   # Check container timezone
+   docker-compose -f docker-compose.prod.yml exec app date
+   # Should show Polish time with CEST/CET timezone
+   
+   # Example output:
+   # Sat Oct  4 19:45:00 CEST 2025
+   ```
+
+8. **Test the fix**
+   - Post a new note at a known time (e.g., 19:45)
+   - Verify it displays the same time (19:45)
+   - Test both project notes and task notes
+
+## What Changed
+
+### Code Changes
+- ✅ Fixed `datetime('now', 'localtime')` in all database queries
+- ✅ Updated display formatters to use Europe/Warsaw timezone
+- ✅ Fixed note display in components
+
+### Docker Changes (Critical!)
+- ✅ Set `ENV TZ=Europe/Warsaw` in Dockerfile
+- ✅ Configured system timezone in containers
+- ✅ Added TZ environment variable to docker-compose files
+
+## Why Rebuild is Necessary
+
+The timezone configuration is **baked into the Docker image** during build time:
+- `ENV TZ=Europe/Warsaw` - Set during image build
+- `RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime` - Executed during image build
+
+Just restarting containers (`docker-compose restart`) will **NOT** apply these changes!
+
+## Troubleshooting
+
+### If times are still wrong after deployment:
+
+1. **Verify you rebuilt the images**
+   ```bash
+   docker images | grep panel
+   # Check the "CREATED" timestamp - should be recent
+   ```
+
+2. **Check if container has correct timezone**
+   ```bash
+   docker-compose -f docker-compose.prod.yml exec app date
+   ```
+   Should show Polish time, not UTC!
+
+3. **Check SQLite is using correct time**
+   ```bash
+   docker-compose -f docker-compose.prod.yml exec app node -e "const db = require('better-sqlite3')('./data/database.sqlite'); console.log(db.prepare(\"SELECT datetime('now', 'localtime') as time\").get());"
+   ```
+   Should show current Polish time
+
+4. **Force rebuild if needed**
+   ```bash
+   docker-compose -f docker-compose.prod.yml down
+   docker system prune -f
+   docker-compose -f docker-compose.prod.yml build --no-cache
+   docker-compose -f docker-compose.prod.yml up -d
+   ```
+
+## Expected Behavior After Fix
+
+### Before Fix (Docker in UTC):
+```
+User posts note at 10:30 Poland time
+→ Docker sees 08:30 UTC as "local time"
+→ SQLite stores: 08:30
+→ Display shows: 08:30 ❌ (2 hours off!)
+```
+
+### After Fix (Docker in Europe/Warsaw):
+```
+User posts note at 10:30 Poland time
+→ Docker sees 10:30 Poland time as "local time"
+→ SQLite stores: 10:30
+→ Display shows: 10:30 ✅ (correct!)
+```
+
+## Important Notes
+
+1. **Old notes**: Notes created before this fix may still show incorrect times (they were stored in UTC)
+2. **New notes**: All new notes after deployment will show correct times
+3. **Audit logs**: Continue to work correctly (they always used ISO format)
+4. **Zero downtime**: Can't achieve - need to stop/rebuild/start containers
+
+## Quick Check Command
+
+After deployment, run this one-liner to verify everything:
+```bash
+docker-compose -f docker-compose.prod.yml exec app sh -c 'date && node -e "console.log(new Date().toLocaleString(\"pl-PL\"))"'
+```
+
+Both outputs should show the same Polish time!