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.

utils/serverUrl/semver.ts

@@ -0,0 +1,22 @@
+/**
+ * Strict numeric "below" comparison for dotted versions.
+ *
+ * Avoids the string-comparison bug (`"1.9.9" < "2.0.0"` works by luck but
+ * `"2.10.0" < "2.0.0"` is wrongly true). Non-numeric/pre-release suffixes on a
+ * segment are ignored (e.g. `2.0.0-beta` → 2.0.0).
+ */
+export function isVersionBelow(version: string, minimum: string): boolean {
+  const parse = (v: string) =>
+    v.split(".").map((segment) => Number.parseInt(segment, 10) || 0);
+
+  const a = parse(version);
+  const b = parse(minimum);
+  const length = Math.max(a.length, b.length);
+
+  for (let i = 0; i < length; i++) {
+    const x = a[i] ?? 0;
+    const y = b[i] ?? 0;
+    if (x !== y) return x < y;
+  }
+  return false;
+}