feat (frontend): Text size accessibility settings (As requested in issue #1482) (#1624)

<img width="496" height="470" alt="Screenshot 2025-10-24 200100"
src="https://github.com/user-attachments/assets/e64ee081-dc08-4b54-94a6-9ed41453cfcf"
/>

This PR adds settings for text size, small, medium (default), large and
extra large.

This should help more people use Dyad more productively.

Closes #1482 
    






<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Adds adjustable workspace zoom levels (90%, 100%, 110%, 125%, 150%) to
improve readability and accessibility. Changes apply instantly and
persist per user, addressing issue #1482.

- **New Features**
  - Zoom selector in Settings → General.
  - Persists zoomLevel in user settings and schema.
  - Applies zoom via Electron webFrame for consistent app scaling.

- **Refactors**
  - Removed deprecated workspaceTextSize setting.
  - Removed root font-size from globals.css.

<sup>Written for commit 54bad25f016a83e9f414025a07e80fdbad859366.
Summary will update automatically on new commits.</sup>

<!-- End of auto-generated description by cubic. -->








<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds adjustable app zoom levels (90–150%) with a Settings selector,
persisted in user settings, and applied via Electron webFrame.
> 
> - **UI/Settings**:
> - Add `ZoomSelector` component and surface it in `Settings → General`
(`src/components/ZoomSelector.tsx`, `src/pages/settings.tsx`).
> - **Schema/Persistence**:
> - Introduce `ZoomLevelSchema` and optional `zoomLevel` in
`UserSettingsSchema` (`src/lib/schemas.ts`).
> - **Electron Integration**:
> - Expose `webFrame.setZoomFactor/getZoomFactor` in `window.electron`
(`src/preload.ts`).
> - **App Behavior**:
> - Apply zoom factor on load and when settings change with default
`100%` (`src/app/layout.tsx`).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
54bad25f016a83e9f414025a07e80fdbad859366. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Devforschool <138079274+Devforschool@users.noreply.github.com>
Co-authored-by: Will Chen <willchen90@gmail.com>

src/app/layout.tsx

@@ -4,18 +4,44 @@ import { ThemeProvider } from "../contexts/ThemeContext";
 import { DeepLinkProvider } from "../contexts/DeepLinkContext";
 import { Toaster } from "sonner";
 import { TitleBar } from "./TitleBar";
-import { useEffect } from "react";
+import { useEffect, type ReactNode } from "react";
 import { useRunApp } from "@/hooks/useRunApp";
 import { useAtomValue } from "jotai";
 import { previewModeAtom } from "@/atoms/appAtoms";
+import { useSettings } from "@/hooks/useSettings";
+import type { ZoomLevel } from "@/lib/schemas";
 
-export default function RootLayout({
-  children,
-}: {
-  children: React.ReactNode;
-}) {
+const DEFAULT_ZOOM_LEVEL: ZoomLevel = "100";
+
+export default function RootLayout({ children }: { children: ReactNode }) {
   const { refreshAppIframe } = useRunApp();
   const previewMode = useAtomValue(previewModeAtom);
+  const { settings } = useSettings();
+
+  useEffect(() => {
+    const zoomLevel = settings?.zoomLevel ?? DEFAULT_ZOOM_LEVEL;
+    const zoomFactor = Number(zoomLevel) / 100;
+
+    const electronApi = (
+      window as Window & {
+        electron?: {
+          webFrame?: {
+            setZoomFactor: (factor: number) => void;
+          };
+        };
+      }
+    ).electron;
+
+    if (electronApi?.webFrame?.setZoomFactor) {
+      electronApi.webFrame.setZoomFactor(zoomFactor);
+
+      return () => {
+        electronApi.webFrame?.setZoomFactor(Number(DEFAULT_ZOOM_LEVEL) / 100);
+      };
+    }
+
+    return () => {};
+  }, [settings?.zoomLevel]);
   // Global keyboard listener for refresh events
   useEffect(() => {
     const handleKeyDown = (event: KeyboardEvent) => {