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/lib/schemas.ts

@@ -211,6 +211,9 @@ export type ContextPathResults = {
 export const ReleaseChannelSchema = z.enum(["stable", "beta"]);
 export type ReleaseChannel = z.infer<typeof ReleaseChannelSchema>;
 
+export const ZoomLevelSchema = z.enum(["90", "100", "110", "125", "150"]);
+export type ZoomLevel = z.infer<typeof ZoomLevelSchema>;
+
 /**
  * Zod schema for user settings
  */
@@ -242,6 +245,7 @@ export const UserSettingsSchema = z.object({
   enableSupabaseWriteSqlMigration: z.boolean().optional(),
   selectedChatMode: ChatModeSchema.optional(),
   acceptedCommunityCode: z.boolean().optional(),
+  zoomLevel: ZoomLevelSchema.optional(),
 
   enableAutoFixProblems: z.boolean().optional(),
   enableNativeGit: z.boolean().optional(),