Revert @shopify/cli-hydrogen from 12.0.0 to 11.1.4 (#3229)

* Revert @shopify/cli-hydrogen from 12.0.0 to 11.1.4

- Change version from 12.0.0 to 11.1.4
- Update CHANGELOG.md: Major Changes → Patch Changes
- Update oclif.manifest.json version

* Revert @shopify/cli-hydrogen to 11.1.3 and add patch changeset

- Revert version from 12.0.0 back to 11.1.3 in package.json and oclif.manifest.json
- Remove 12.0.0 section from CHANGELOG.md (will be regenerated as 11.1.4)
- Add patch changeset with all original changelog content
- When Version PR is created, it will bump to 11.1.4 with proper patch designation

Author: juanpprieto

.changeset/revert-cli-hydrogen-version.md

@@ -0,0 +1,41 @@
+---
+'@shopify/cli-hydrogen': patch
+---
+
+**What changed:**
+
+## Miniflare v3 upgrade
+
+## CLI: Stabilized Customer Account API development flag
+
+The `--customer-account-push` flag is now stable and ready for production use. This flag enables tunneling for local development with Customer Account API OAuth flows.
+
+**Before:**
+
+```bash
+# Flag was experimental with __unstable suffix
+shopify hydrogen dev --customer-account-push__unstable
+```
+
+**After:**
+
+```bash
+# Flag is now stable
+shopify hydrogen dev --customer-account-push
+
+# Or use environment variable
+SHOPIFY_HYDROGEN_FLAG_CUSTOMER_ACCOUNT_PUSH=true npm run dev
+```
+
+This flag automatically:
+
+- Creates a tunnel for your local development server
+- Configures the Customer Account API OAuth callback URLs
+- Enables testing of the full authentication flow locally
+
+## Additional changes
+
+- Fix defer/streaming in development & preview
+- Upgrade Miniflare from v2 to v4 in mini-oxygen package
+- Add `--force-client-sourcemap` flag support to the `deploy` command
+- Implement proper environment variable quoting for shell metacharacters in `env pull` command