Let users choose the metadata generation model (#3215)

Expose Automatic and Manual metadata model selection in Host Settings, preserve existing configured fallbacks, and keep structured generation resilient through discovered candidates. Includes Playwright coverage, translations, public documentation, and settings-row alignment polish.

packages/app/src/i18n/resources/en.ts

@@ -1773,12 +1773,27 @@ export const en = {
       projects: "Projects",
       connections: "Connections",
       agents: "Agents",
+      metadata: "Metadata",
       workspaces: "Workspaces",
       providers: "Providers",
       usage: "Usage",
       terminals: "Terminals",
       host: "Overview",
     },
+    metadataGeneration: {
+      title: "Metadata generation",
+      description:
+        "Choose the model Paseo uses for workspace titles, branch names, commit messages, and pull request drafts",
+      selection: "Model selection",
+      automatic: "Automatic",
+      preferred: "Manual",
+      automaticHint: "Paseo picks a fast available model",
+      preferredHint: "Choose the model Paseo uses",
+      model: "Model",
+      fallbackHint: "If it is unavailable, Paseo falls back to another available model",
+      docs: "Docs",
+      saveError: "Unable to update metadata generation",
+    },
     general: {
       title: "General",
       browserData: {