refactor(input): R10 S3b — one input recipe, ring focus everywhere

Unify text inputs onto the form.tsx inputCls look (surface bg, rounded-lg, 2px accent
RING focus), replacing the settings-family border-focus style app-wide:
- deleted 3 duplicate local `const inputCls` (KeyGate/SettingsPanel/SetupWizard) → import
  the shared one; a 4th (Welcome, py-2.5) kept local but re-styled to match.
- ~30 inline settings inputs: default full-size fields → inputCls; size variants (pager/
  table-filter/chat textarea/plex/glass-card) keep their width/radius/padding but swap
  bg-card→bg-surface and border-focus→ring-focus. glass-card/bg-transparent bgs left as-is.
- refreshed the form.tsx doc-comment (the old two-style split is gone).

The ring is the more visible / a11y-correct focus cue, matching R9's focus foundation.

frontend/src/components/SetupWizard.tsx

@@ -4,6 +4,7 @@ import { Check, ChevronLeft, ChevronRight, Loader2, Send } from "lucide-react";
 import { api, HttpError } from "../lib/api";
 import { setLanguage, type LangCode } from "../i18n";
 import LanguageSwitcher from "./LanguageSwitcher";
+import { inputCls } from "./ui/form";
 
 // First-run install wizard. Shown by App.tsx while the instance is unconfigured. The one-time
 // setup token comes from the URL the app printed to the container logs (?token=…); every step
@@ -129,9 +130,6 @@ export default function SetupWizard() {
     }
   }
 
-  const inputCls =
-    "w-full bg-card border border-border rounded-xl px-3 py-2 text-sm outline-hidden focus:border-accent";
-
   return (
     <Centered>
       <div className="w-full max-w-lg">