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

tsconfig.base.json

@@ -0,0 +1,19 @@
+{
+	"compilerOptions": {
+		"target": "ES2024",
+		"module": "preserve",
+		"lib": ["ES2024"],
+		"moduleResolution": "bundler",
+		"resolveJsonModule": true,
+		"allowJs": false,
+		"strict": true,
+		"esModuleInterop": true,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true,
+		"declaration": true,
+		"declarationMap": true,
+		"sourceMap": true,
+		"noUncheckedIndexedAccess": true,
+		"noImplicitOverride": true
+	}
+}