feat(settings): unified server-URL resolver + field; adopt in Jellyseerr

Type a loose address (media.example.com, https://…, host:port) and the app finds the working, canonical URL.

- utils/serverUrl: generic candidate generator (https-first, port/path preserved, no Jellyfin-specific ports), parallel-probe resolver, numeric semver compare, and a Jellyseerr probe (/api/v1/status, min 2.0.0).

- useServerUrlResolver: idle -> resolving -> ok | error state machine with cancellation.

- ServerUrlField: shared input that auto-resolves on blur, inline status chip (tap to re-test) + resolved URL, persists the canonical URL.

- Jellyseerr settings adopt the field and log in with the resolved URL. Probe contract makes Streamystats/Jellyfin/Merlin a drop-in follow-up.

hooks/useServerUrlResolver.ts

@@ -0,0 +1,69 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+import {
+  type ResolveFailureReason,
+  type ResolveOptions,
+  type ResolveResult,
+  resolveServerUrl,
+} from "@/utils/serverUrl/resolve";
+import type { ServerProbe } from "@/utils/serverUrl/types";
+
+export type ServerUrlResolverState =
+  | { status: "idle" }
+  | { status: "resolving" }
+  | { status: "ok"; resolvedUrl: string; meta?: Record<string, unknown> }
+  | { status: "error"; reason: ResolveFailureReason; version?: string };
+
+/**
+ * Stateful wrapper around `resolveServerUrl` for screens.
+ *
+ * `resolve(input)` cancels any in-flight resolution, drives the state machine
+ * (idle → resolving → ok | error) and returns the raw result. Pass a stable
+ * (module-level) probe; memoize `options` if you supply one.
+ */
+export function useServerUrlResolver(
+  probe: ServerProbe,
+  options?: ResolveOptions,
+) {
+  const [state, setState] = useState<ServerUrlResolverState>({
+    status: "idle",
+  });
+  const abortRef = useRef<AbortController | null>(null);
+
+  const resolve = useCallback(
+    async (input: string): Promise<ResolveResult> => {
+      abortRef.current?.abort();
+      const controller = new AbortController();
+      abortRef.current = controller;
+      setState({ status: "resolving" });
+
+      const result = await resolveServerUrl(input, probe, {
+        ...options,
+        signal: controller.signal,
+      });
+
+      // Ignore results from a resolution that was superseded/cancelled.
+      if (!controller.signal.aborted) {
+        setState(
+          result.ok
+            ? { status: "ok", resolvedUrl: result.url, meta: result.meta }
+            : {
+                status: "error",
+                reason: result.reason,
+                version: result.version,
+              },
+        );
+      }
+      return result;
+    },
+    [probe, options],
+  );
+
+  const reset = useCallback(() => {
+    abortRef.current?.abort();
+    setState({ status: "idle" });
+  }, []);
+
+  useEffect(() => () => abortRef.current?.abort(), []);
+
+  return { ...state, resolve, reset };
+}