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

tauri-app/tailwind.config.js

@@ -0,0 +1,26 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ["./index.html", "./src/**/*.{ts,tsx}"],
+  corePlugins: { preflight: false }, // preserve existing hand-crafted CSS
+  theme: {
+    extend: {
+      colors: {
+        "c-bg":      "var(--bg)",
+        "c-bg2":     "var(--bg2)",
+        "c-bg3":     "var(--bg3)",
+        "c-bg4":     "var(--bg4)",
+        "c-bg5":     "var(--bg5)",
+        "c-bdr":     "var(--border)",
+        "c-bdr2":    "var(--border2)",
+        "c-tx":      "var(--text)",
+        "c-tx2":     "var(--text2)",
+        "c-tx3":     "var(--text3)",
+        "c-ac":      "var(--accent)",
+        "c-ac2":     "var(--accent2)",
+        "c-danger":  "var(--danger)",
+        "c-success": "var(--success)",
+        "c-warn":    "var(--warning)",
+      },
+    },
+  },
+};