feat: add SettingsPage with HuggingFace model search and fix flexbox layout

- Add SettingsPage component with macOS/Linear-style settings UI (sp-* classes)
- Fix HuggingFace results list squeeze: sp-card-row--full now has align-items: stretch
  overriding the inherited flex-start, ensuring children fill 100% horizontal width
- Fix sp-hf-file row layout: width 100%, grid columns for name/quant/size/download
- Fix sp-hf-name truncation: explicit overflow/ellipsis/white-space in CSS
- Add white-space: nowrap to sp-hf-size and sp-hf-quant-badge to protect secondary columns
- Add runtime-deps crate, Tailwind/PostCSS config, runtime-defaults, MessageBubble test
- Update Cargo workspace, inference-server, tauri runtime types and process handling

crates/inference-server/Cargo.toml

@@ -12,6 +12,8 @@ path = "src/main.rs"
 inference-core = { path = "../inference-core" }
 api-contracts = { path = "../api-contracts" }
 metrics = { path = "../metrics" }
+runtime-deps = { path = "../runtime-deps" }
+dirs = { workspace = true }
 tokio.workspace = true
 axum.workspace = true
 hyper.workspace = true