WIP: feat(test): Add framework of real-Obsidian based e2e test

test_e2e/playwright.config.ts

@@ -0,0 +1,25 @@
+import { defineConfig } from "playwright/test";
+import path from "node:path";
+
+export default defineConfig({
+    testDir: path.join(__dirname, "tests"),
+    outputDir: path.join(__dirname, "test-results"),
+
+    // Each test may need to cold-start Obsidian and wait for the vault to load.
+    timeout: 120_000,
+    expect: { timeout: 20_000 },
+
+    // Tests are stateful (one Obsidian process per test file), so no parallelism.
+    fullyParallel: false,
+    workers: 1,
+    retries: 0,
+
+    reporter: [["list"], ["html", { open: "never", outputFolder: path.join(__dirname, "playwright-report") }]],
+
+    use: {
+        // Artefacts are kept only when a test fails.
+        screenshot: "only-on-failure",
+        video: "retain-on-failure",
+        trace: "retain-on-failure",
+    },
+});