Upgrade Effect v4 beta compatibility and refresh package branding (#8)

# PR description

## Summary

- Upgrade the Effect v4 package from `4.0.0-beta.98` to `4.0.0-beta.101`.
- Bump `effect-lens-next` to `2.0.0-beta.101`.
- Normalize the v4 `LensImpl` and `ViewImpl` global symbol keys under the `@effect-lens` namespace.
- Upgrade the monorepo toolchain, including TypeScript 7, Turbo, Biome, the Effect language service, and npm-check-updates.
- Refresh the lockfile with the updated dependency graph.
- Add new wide and square Effect Lens SVG branding.
- Improve both npm README headers with:
  - The new square logo.
  - Package version, download, license, and Effect compatibility badges.
  - Clear warnings distinguishing the Effect v3 stable release from the Effect v4 beta.
- Include the square logo in both published npm packages.

## Validation

- TypeScript checks pass.
- Both SVG assets validate successfully.
- `npm pack --dry-run --ignore-scripts` succeeds for both packages.
- Both npm tarballs include their relative README logo assets.

---------

Co-authored-by: Julien Valverdé <julien.valverde@mailo.com>
Reviewed-on: #8

packages/effect-lens-next/package.json

@@ -1,10 +1,11 @@
 {
   "name": "effect-lens-next",
   "description": "An effectful Lens type to easily manage nested state",
-  "version": "2.0.0-beta.1",
+  "version": "2.0.0-beta.101",
   "type": "module",
   "files": [
     "./README.md",
+    "./logo-square.svg",
     "./dist"
   ],
   "license": "MIT",
@@ -36,9 +37,9 @@
     "clean:modules": "rm -rf node_modules"
   },
   "peerDependencies": {
-    "effect": "4.0.0-beta.98"
+    "effect": "4.0.0-beta.101"
   },
   "devDependencies": {
-    "effect": "4.0.0-beta.98"
+    "effect": "4.0.0-beta.101"
   }
 }