Unnest bubble filters

app/javascript/controllers/back_navigation_controller.js

@@ -0,0 +1,13 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static values = { fallbackDestination: String }
+
+  connect() {
+    if (history.state.turbo?.restorationIndex > 0) {
+      this.element.href = "javascript:history.back()"
+    } else {
+      this.element.href = this.fallbackDestinationValue
+    }
+  }
+}

app/javascript/controllers/query_merger_controller.js

@@ -0,0 +1,9 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  merge({ params: { key, value } }) {
+    const url = new URL(window.location.href)
+    url.searchParams.set(key, value)
+    Turbo.visit(url)
+  }
+}