feat(client): modern CLI output + Windows exe icon

- Replace timestamp-based log macros with colored CLI output system
  using the `colored` crate
- Banner on startup: ☀ HELIOS REMOTE + separator line
- Colored prefixes: cyan → (status), green ✓ (ok), red ✗ (error),
  yellow ⚡ (incoming commands)
- Session info on connect: ✓ Connected · <label> · Session <id>
- No timestamps, no [CMD]/[OK]/[ERR] prefixes
- Suppress tracing output by default (RUST_LOG=off unless set)
- Add build.rs to embed logo.ico as Windows resource via winres
- Add winres as build-dependency in client Cargo.toml

crates/client/Cargo.toml

@@ -22,6 +22,10 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 base64 = "0.22"
 png = "0.17"
 futures-util = "0.3"
+colored = "2"
+
+[build-dependencies]
+winres = "0.1"
 
 [target.'cfg(windows)'.dependencies]
 windows = { version = "0.54", features = [