feat(apple): transfer controls, progress fixes, and project config

- Sender progress: aggregate only in-flight receivers so the bar clears on
  completion and is order-independent ("Sending to N")
- Add Stop sharing and per-receiver Refuse (pending requests) on the sender
- Fix macOS: raise approval modal above the Share sheet; drive foreground
  state off NSApplication so background notifications fire
- Persist app identity (display name, category) and signing team via
  Info.plist / project.yml / gitignored Local.xcconfig

apple/VniDrop/Resources/Localizable.xcstrings

@@ -1185,6 +1185,16 @@
         }
       }
     },
+    "progress_sending_to_count" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Sending to %lld"
+          }
+        }
+      }
+    },
     "progress_share_ready" : {
       "localizations" : {
         "en" : {
@@ -1627,6 +1637,26 @@
         }
       }
     },
+    "send_stop_sharing" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Stop sharing"
+          }
+        }
+      }
+    },
+    "send_stop_sharing_description" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "This stops the transfer and interrupts anyone currently downloading it. It stays in your history as Stopped."
+          }
+        }
+      }
+    },
     "send_title" : {
       "localizations" : {
         "en" : {