test: migrate e2e to Playwright and component test to Vitest browser mode

Replace Cypress with Playwright for the end-to-end suite and drop
@shellygo/cypress-test-utils in favour of a hand-written MaputnikDriver
page object that keeps the fluent then(...).shouldX() assertion style
(now async). The InputAutocomplete component test moves to Vitest browser
mode using the Playwright provider.

- e2e/maputnik-driver.ts: driver + MaputnikAssertable over Playwright
- e2e/{fixtures,coverage,global-setup,global-teardown}.ts: test fixture,
  istanbul coverage collection, and nyc report generation
- playwright.config.ts / vitest.config.ts
- Code coverage preserved: dev server is istanbul-instrumented, per-test
  window.__coverage__ is merged via nyc into coverage/coverage-final.json
- CI: Cypress jobs replaced with Playwright; docker e2e runs against the
  container via E2E_NO_WEBSERVER
- Remove Cypress deps, config and support files; update docs and .nycrc

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

tsconfig.json

@@ -3,7 +3,7 @@
       "target": "ES2020",
       "useDefineForClassFields": true,
       "lib": ["ES2020", "DOM", "DOM.Iterable"],
-      "types": ["geojson", "@types/wicg-file-system-access"],
+      "types": ["geojson", "@types/wicg-file-system-access", "node"],
       "module": "ESNext",
       "skipLibCheck": true,
 
@@ -21,14 +21,7 @@
       "noUnusedParameters": true,
       "noFallthroughCasesInSwitch": true
     },
-    "include": ["src", "cypress/e2e"],
+    "include": ["src", "e2e"],
     "exclude": ["dist"],
-    "references": [{ "path": "./tsconfig.node.json" }],
-    // TODO: Remove when issue is resolved https://github.com/cypress-io/cypress/issues/27448
-    "ts-node": {
-      "compilerOptions": {
-        "module": "ESNext",
-        "moduleResolution": "Node",
-      }
-    }
+    "references": [{ "path": "./tsconfig.node.json" }]
 }