fix(desktop): claim Cmd/Ctrl+R in before-input-event so it works off macOS

The application menu is only installed on macOS (#77845) — everywhere
else it is set to null, which strips the role accelerators with it. A
menu-only Cmd+R meant Windows and Linux got no page reload at all.

Moves the claim into the same before-input-event hook Cmd+W already uses
for exactly this reason, and drops the accelerator from the menu item so
one keypress can't fire both paths on macOS.

apps/desktop/electron/main.ts

@@ -6138,11 +6138,11 @@ function buildApplicationMenu() {
       // whole shell) and a focused in-app browser needs ⌘R to mean "reload
       // this page", the way it does in every other browser. ⇧⌘R
       // (`forceReload`) below stays the unconditional escape hatch.
-      {
-        accelerator: 'CommandOrControl+R',
-        label: 'Reload',
-        click: () => sendPreviewNavCommand('reload')
-      },
+      //
+      // No accelerator: ⌘R is claimed in `installPreviewShortcut`, which works
+      // on every platform (this menu exists only on macOS). Declaring it here
+      // too would fire the item and the input hook for one keypress.
+      { click: () => sendPreviewNavCommand('reload'), label: 'Reload' },
       { role: 'forceReload' },
       {
         label: 'Toggle Developer Tools',
@@ -6241,17 +6241,28 @@ function installDevToolsShortcut(window) {
 function installPreviewShortcut(window) {
   window.webContents.on('before-input-event', (event, input) => {
     const key = String(input.key || '').toLowerCase()
-    const isCloseTabShortcut = key === 'w' && (IS_MAC ? input.meta : input.control) && !input.alt && !input.shift
+    const accel = (IS_MAC ? input.meta : input.control) && !input.alt
+    const isCloseTabShortcut = key === 'w' && accel && !input.shift
 
     // Always claim ⌘W here (the File>Close item deliberately has no
     // accelerator, so nothing else does). The renderer decides tab-vs-window
     // — no `previewShortcutActive` gate, so it works for every closeable tab.
-    if (!isCloseTabShortcut) {
+    if (isCloseTabShortcut) {
+      event.preventDefault()
+      sendClosePreviewRequested()
+
       return
     }
 
-    event.preventDefault()
-    sendClosePreviewRequested()
+    // ⌘R rides here rather than on the View menu item for the same reason:
+    // the application menu only exists on macOS (it is set to null elsewhere,
+    // see #77845), so a menu accelerator would leave Windows and Linux with no
+    // way to reload a page at all. ⇧⌘R is left alone — that is `forceReload`,
+    // the unconditional whole-window escape hatch.
+    if (key === 'r' && accel && !input.shift) {
+      event.preventDefault()
+      sendPreviewNavCommand('reload')
+    }
   })
 }