Update dependencies and UI for WASM compatibility

- Simplify Cargo.toml dependencies for frontend-only build
- Add comprehensive CSS styling with responsive design
- Update app routing and main module structure
- Fix WASM getrandom compatibility with js feature

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

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

Cargo.toml

@@ -10,8 +10,6 @@ wasm-bindgen = "0.2"
 
 # HTTP client for CalDAV requests
 reqwest = { version = "0.11", features = ["json"] }
-wasm-bindgen-futures = "0.4"
-
 # Calendar and iCal parsing
 ical = "0.7"
 serde = { version = "1.0", features = ["derive"] }
@@ -30,7 +28,8 @@ log = "0.4"
 console_log = "1.0"
 
 # UUID generation for calendar events
-uuid = { version = "1.0", features = ["v4", "wasm-bindgen"] }
+uuid = { version = "1.0", features = ["v4", "wasm-bindgen", "serde"] }
+getrandom = { version = "0.2", features = ["js"] }
 
 # Environment variable handling
 dotenvy = "0.15"
@@ -39,5 +38,16 @@ base64 = "0.21"
 # XML/Regex parsing
 regex = "1.0"
 
+# Frontend authentication (backend removed for WASM compatibility)
+# sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "sqlite", "chrono", "uuid", "migrate"] }
+# bcrypt = "0.15"
+# jsonwebtoken = "9.0"
+
+# Yew routing and local storage
+yew-router = "0.18"
+gloo-storage = "0.3"
+gloo-timers = "0.3"
+wasm-bindgen-futures = "0.4"
+
 [dev-dependencies]
 tokio = { version = "1.0", features = ["macros", "rt"] }