Add tsconfig for the e2e tests

Gives editors a TS project covering tests/e2e so the $src alias,
@playwright/test, and the window.bubbles harness globals resolve —
clearing the editor-only errors in the fixture. `bun run check` uses
the root tsconfig (which excludes tests/), so the lint/CI gate is
unchanged.

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

Author: githyperplexed

tests/e2e/tsconfig.json

@@ -0,0 +1,14 @@
+{
+	// Gives editors a TS project for the e2e files so the `$src` alias,
+	// @playwright/test, and the window.bubbles harness globals resolve.
+	// `bun run check` uses the root tsconfig (which excludes tests/), so this
+	// is editor-only and doesn't change the lint/CI gate.
+	"extends": "../../tsconfig.json",
+	"compilerOptions": {
+		"types": ["@playwright/test", "vite/client", "node"],
+		"paths": {
+			"$src/*": ["../../src/*"]
+		}
+	},
+	"include": ["**/*.ts"]
+}