feat(profiles): add setting to toggle project switcher on main page

Add a show/hide toggle for the header project profile switcher under
the Homepage Display section in settings. Defaults to visible so
existing users keep the current behavior.

src/App.tsx

@@ -1263,14 +1263,15 @@ function App() {
                     )}
                 </div>
               )}
-            {currentView === "providers" && (
-              <div
-                className="flex shrink-0 items-center"
-                style={{ WebkitAppRegion: "no-drag" } as any}
-              >
-                <ProfileSwitcher activeApp={activeApp} />
-              </div>
-            )}
+            {currentView === "providers" &&
+              (settingsData?.showProfileSwitcher ?? true) && (
+                <div
+                  className="flex shrink-0 items-center"
+                  style={{ WebkitAppRegion: "no-drag" } as any}
+                >
+                  <ProfileSwitcher activeApp={activeApp} />
+                </div>
+              )}
             <div
               ref={toolbarRef}
               className="flex flex-1 min-w-0 overflow-x-hidden items-center py-4 pr-2"