Add in-app diagnostic logging + resilient inbox; bump to 1.2

- LogStore: bounded in-memory + persisted log of API calls and errors,
  viewable and shareable from Settings → View logs.
- GiteaClient: log every request/response status (esp. 404s).
- Inbox: a single failing repo no longer wipes the whole inbox — per-repo
  errors are caught, logged, and the rest still load.
- Bump to 1.2 so SideStore offers the update.

GiteaPR/Networking/GiteaClient.swift

@@ -78,18 +78,23 @@ struct GiteaClient {
 
         let (data, response) = try await session.data(for: req)
         guard let http = response as? HTTPURLResponse else {
+            LogStore.shared.log(.error, "\(method) \(path) → invalid response")
             throw APIError.invalidResponse
         }
         switch http.statusCode {
         case 200...299:
+            LogStore.shared.log(.info, "\(method) \(path) → \(http.statusCode)")
             return data
         case 401, 403:
+            LogStore.shared.log(.error, "\(method) \(path) → \(http.statusCode) unauthorized")
             throw APIError.unauthorized
         case 404:
+            LogStore.shared.log(.error, "\(method) \(path) → 404 not found")
             throw APIError.notFound
         default:
             let message = (try? Self.decoder.decode([String: String].self,
                                                      from: data))?["message"]
+            LogStore.shared.log(.error, "\(method) \(path) → \(http.statusCode) \(message ?? "")")
             throw APIError.httpStatus(http.statusCode, message)
         }
     }