ci: make vite 7 catalog swap version-agnostic and remove local script

Replace sed patterns that matched specific version strings with
patterns that match the key name and replace any value after it.
Remove the local e2e-vite7.sh script since CI handles this now.

https://claude.ai/code/session_014gm5pSZ82jEKdrh4TLeTuC

Author: claude

.github/workflows/ci.yml

@@ -95,8 +95,8 @@ jobs:
       - name: Swap catalog to Vite 7
         run: |
           sed -i \
-            -e 's|"@vitejs/plugin-react": \^6\.0\.1|"@vitejs/plugin-react": ^5.1.4|' \
-            -e 's|vite: \^8\.0\.0|vite: ^7.3.1|' \
+            -e 's|^\(  "@vitejs/plugin-react":\).*|\1 ^5.1.4|' \
+            -e 's|^\(  vite:\).*|\1 ^7.3.1|' \
             pnpm-workspace.yaml
 
       - name: Install dependencies