Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

infra/perf-monitor/tsconfig.json

@@ -0,0 +1,17 @@
+{
+	"compilerOptions": {
+		"target": "es2023",
+		"module": "esnext",
+		"moduleResolution": "bundler",
+		"lib": ["es2023"],
+		"types": [],
+		"strict": true,
+		"noUncheckedIndexedAccess": true,
+		"noImplicitOverride": true,
+		"verbatimModuleSyntax": true,
+		"isolatedModules": true,
+		"skipLibCheck": true,
+		"noEmit": true
+	},
+	"include": ["src", "probe/src", "worker-configuration.d.ts"]
+}