browser: drop in-guest zoom locks so pinch and cmd+wheel zoom the page

setVisualZoomLevelLimits(1, 1) blocked pinch-to-zoom inside the webview, and
setZoomFactor(1) on every dom-ready reset any user page zoom. Both were added
back when canvas zoom was supposed to take over for ctrl+wheel; with that
reverted, chromium's native zoom handlers should run unimpeded.

frontend/src/app/pages/Dashboard/cards/BrowserCard.tsx

@@ -303,11 +303,6 @@ const BrowserCard: React.FC<Props> = ({
           // (the historical Windows mount segfault). Clear the crash-safety marker.
           if (isWindows) markWindowsWebviewSurvived();
           wv.loadURL(targetUrl).catch(() => {});
-          // Disable in-guest pinch zoom; page zoom (cmd+= / cmd+-) still works via chromium.
-          try {
-            (wv as any).setVisualZoomLevelLimits?.(1, 1);
-            (wv as any).setZoomFactor?.(1);
-          } catch (_) {}
         };
         wv.addEventListener('dom-ready', doLoad, { once: true });
         cleanups.push(() => wv.removeEventListener('dom-ready', doLoad));