Add print preview modal with hour range selection

Implements comprehensive print functionality for calendar views:
- Print preview modal with live preview and zoom controls
- Hour range selection for week view (start/end hours)
- Print-specific CSS to hide UI elements and optimize layout
- Event repositioning to align with visible time labels
- Support for both 30-minute and 15-minute time increments
- Mouse wheel zoom functionality in preview

🤖 Generated with [Claude Code](https://claude.ai/code)

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

frontend/Trunk.toml

@@ -6,7 +6,7 @@ dist = "dist"
 BACKEND_API_URL = "http://localhost:3000/api"
 
 [watch]
-watch = ["src", "Cargo.toml", "../calendar-models/src", "styles.css", "index.html"]
+watch = ["src", "Cargo.toml", "../calendar-models/src", "styles.css", "print.css", "print-preview.css", "index.html"]
 ignore = ["../backend/", "../target/"]
 
 [serve]