test: relocate Cypress e2e suite to e2e/ ahead of Playwright migration

Pure file moves (no content changes) so git records them as renames and
history/blame is preserved through the migration that follows:
  cypress/e2e/*.cy.ts        -> e2e/*.spec.ts
  cypress/e2e/*-driver.ts    -> e2e/*-driver.ts
  cypress/fixtures/          -> e2e/fixtures/
  cypress.config.ts          -> playwright.config.ts
  InputAutocomplete.cy.tsx   -> InputAutocomplete.browser.test.tsx

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

e2e/fixtures/example-layer-style.json

@@ -0,0 +1,17 @@
+{
+  "id": "test-style",
+  "version": 8,
+  "name": "Test Style",
+  "metadata": {
+    "maputnik:renderer": "mlgljs"
+  },
+  "sources": {},
+  "glyphs": "https://example.local/fonts/{fontstack}/{range}.pbf",
+  "sprites": "https://example.local/fonts/{fontstack}/{range}.pbf",
+  "layers": [
+    {
+      "id": "background",
+      "type": "background"
+    }
+  ]
+}