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/src/features/runtime/components/RuntimeSettingsDrawer.tsx

@@ -16,6 +16,7 @@ import {
   resolveDraftModelSelection,
   toModelFile,
 } from "../runtime-settings-form";
+import { CTX_PRESETS, DEFAULT_CTX_SIZE, MIN_CTX_SIZE } from "../runtime-defaults";
 import {
   createRuntimeDraftFieldState,
   type ModelLibraryState,
@@ -31,7 +32,6 @@ import {
 } from "../types";
 import "./RuntimeSettingsDrawer.css";
 
-const CTX_PRESETS = [2048, 4096, 8192, 16384, 32768, 65536];
 const REMOTE_PRESET_TEMPLATES = [
   { id: "openai", label: "OpenAI", provider: "open_ai", baseUrl: "https://api.openai.com/v1" },
   { id: "openrouter", label: "OpenRouter", provider: "open_router", baseUrl: "https://openrouter.ai/api/v1" },
@@ -799,10 +799,10 @@ export default function RuntimeSettingsDrawer({
                   <input
                     id="runtime-context"
                     className={`runtime-field-input${isFieldDirty("ctx_size") ? " is-draft" : ""}`}
-                    min={512}
+                    min={MIN_CTX_SIZE}
                     step={512}
                     value={draftConfig.ctx_size}
-                    onChange={(event) => updateDraft({ ctx_size: Math.max(512, parseInt(event.target.value, 10) || 4096) })}
+                    onChange={(event) => updateDraft({ ctx_size: Math.max(MIN_CTX_SIZE, parseInt(event.target.value, 10) || DEFAULT_CTX_SIZE) })}
                     type="number"
                   />
                 </div>