Remove in-list spinner + add monitored-repos setting; bump to 2.3

- Remove the in-list loading wheel overlay; the landing page just shows the
  cached list or the 'No open PRs' screen.
- Add a 'Monitored repos' setting (Settings > Inbox) that limits the inbox to
  specific repos, cutting the number of API calls dramatically. Empty =
  monitor all accessible repos. Bump to 2.3.

GiteaPR/Inbox/InboxViewModel.swift

@@ -47,14 +47,21 @@ final class InboxViewModel: ObservableObject {
 
         do {
             let repos = try await client.repos()
-            LogStore.shared.log(.info, "Inbox: \(repos.count) repos")
-            // Fetch open PRs across all repos concurrently. A single repo that
-            // fails (e.g. 404) must NOT wipe the whole inbox — catch per-repo
-            // errors, log them, and keep whatever succeeded.
+            // If the user has configured monitored repos, only fetch PRs for
+            // those — this cuts the number of API calls dramatically (the
+            // inbox was fetching every accessible repo).
+            let monitored = SettingsStore.shared.monitoredRepos
+            let targets = monitored.isEmpty
+                ? repos
+                : repos.filter { monitored.contains($0.fullName) }
+            LogStore.shared.log(.info, "Inbox: \(targets.count)/\(repos.count) repos")
+            // Fetch open PRs across the target repos concurrently. A single
+            // repo that fails (e.g. 404) must NOT wipe the whole inbox — catch
+            // per-repo errors, log them, and keep whatever succeeded.
             var rows: [PRRow] = []
             var failures: [String] = []
             await withTaskGroup(of: Result<[PRRow], Error>.self) { group in
-                for repo in repos {
+                for repo in targets {
                     group.addTask {
                         do {
                             let prs = try await client.pullRequests(owner: repo.owner.login,