devDeps: Install madge

This installs [madge](https://www.npmjs.com/package/madge), a tool for finding circular dependencies. A config file is also added to ignore type-only imports.

.gitignore

@@ -24,3 +24,6 @@ coverage
 
 *~
 bots
+
+# madge graph of dependencies generated by `npm run circular:graph`
+deps.png

.madgerc

@@ -0,0 +1,7 @@
+{
+	"detectiveOptions": {
+		"ts": {
+			"skipTypeImports": true
+		}
+	}
+}

package.json

@@ -61,6 +61,7 @@
     "history": "5.3.0",
     "identity-obj-proxy": "3.0.0",
     "jsdom": "25.0.1",
+    "madge": "8.0.0",
     "moment": "2.30.1",
     "msw": "2.4.9",
     "npm-run-all": "4.1.5",
@@ -96,7 +97,9 @@
     "api:generate": "bash api/codegen.sh",
     "api:pull": "bash api/pull.sh",
     "verify": "npm-run-all build lint test",
-    "postinstall": "ts-patch install"
+    "postinstall": "ts-patch install",
+    "circular": "madge --circular ./src --extensions js,ts,tsx",
+    "circular:graph": "madge --circular ./src --extensions js,ts,tsx -i deps.png"
   },
   "insights": {
     "appname": "image-builder"