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

knip.json

@@ -0,0 +1,36 @@
+{
+	"$schema": "https://unpkg.com/knip@5/schema.json",
+	"workspaces": {
+		".": {
+			"entry": ["e2e/**/*.ts"],
+			"project": ["e2e/**/*.ts"]
+		},
+		"packages/core": {
+			"entry": ["src/astro/**/*.ts", "src/db/*.ts", "src/storage/*.ts"],
+			"ignoreDependencies": [
+				"cloudflare",
+				"@aws-sdk/client-s3",
+				"@aws-sdk/s3-request-presigner",
+				"@vitest/coverage-v8"
+			]
+		},
+		"packages/auth": {
+			"ignoreDependencies": ["cloudflare", "kysely"]
+		},
+		"packages/admin": {},
+		"packages/gutenberg-to-portable-text": {},
+		"packages/sandbox-cloudflare": {
+			"ignoreDependencies": ["cloudflare"]
+		},
+		"packages/plugins/*": {},
+		"demos/*": {
+			"entry": ["src/**/*.{ts,astro}"],
+			"ignoreDependencies": ["better-sqlite3", "kysely-d1", "@astrojs/check"]
+		},
+		"demos/cloudflare": {
+			"ignoreDependencies": ["cloudflare", "kysely-d1"]
+		}
+	},
+	"ignore": ["**/dist/**", "**/*.d.ts"],
+	"ignoreDependencies": ["@changesets/cli"]
+}