fix(frontend): GIFバナーの復活など (#10247)

* Restore GIF banner

* Add ALT banner, detect APNG too

* Add vitest

* Add CI for vitest

* Upload coverage?

* frontend

packages/frontend/test/tsconfig.json

@@ -0,0 +1,43 @@
+{
+	"compilerOptions": {
+		"allowJs": true,
+		"noEmitOnError": false,
+		"noImplicitAny": true,
+		"noImplicitReturns": true,
+		"noUnusedParameters": false,
+		"noUnusedLocals": true,
+		"noFallthroughCasesInSwitch": true,
+		"declaration": false,
+		"sourceMap": true,
+		"target": "es2021",
+		"module": "es2020",
+		"moduleResolution": "node",
+		"allowSyntheticDefaultImports": true,
+		"removeComments": false,
+		"noLib": false,
+		"strict": true,
+		"strictNullChecks": true,
+		"strictPropertyInitialization": false,
+		"experimentalDecorators": true,
+		"emitDecoratorMetadata": true,
+		"resolveJsonModule": true,
+		"isolatedModules": true,
+		"baseUrl": "./",
+		"paths": {
+			"@/*": ["../src/*"]
+		},
+		"typeRoots": [
+			"../node_modules/@types",
+		],
+		"lib": [
+			"esnext",
+			"dom"
+		],
+		"types": ["node"]
+	},
+	"compileOnSave": false,
+	"include": [
+		"./**/*.ts",
+		"../src/**/*.vue",
+	]
+}