Fix macOS icon padding, Quit/Hide menu labels, OSS config dir, Bedrock tool_result pairing

- Icon now follows Apple HIG: artwork at 80% canvas with transparent padding
- Quit Warp -> Quit Galaxy, Hide Warp -> Hide Galaxy in macOS menus
- OSS channel uses ~/.galaxy (no -oss suffix)
- Robust ensure_tool_results_paired: positional adjacency validation for Bedrock API

app/src/quit_warning/mod.rs

@@ -435,7 +435,7 @@ impl<'a> QuitWarningDialog<'a> {
             QuitScope::Tabs(tabs) if tabs.len() == 1 => "Close tab?",
             QuitScope::Tabs(_) => "Close tabs?",
             QuitScope::Window(_) => "Close window?",
-            QuitScope::App => "Quit Warp?",
+            QuitScope::App => "Quit Galaxy?",
             QuitScope::EditorTab { .. } => "Save changes?",
         };