Fix: Keep the previous filtering when navigating back from cards

https://fizzy.37signals.com/5986089/cards/1760/edit

This also adds a proper resource for filtered collections, instead of changing the URL to cards for filtering cards.

app/javascript/controllers/turbo_navigation_controller.js

@@ -0,0 +1,25 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  rememberLocation() {
+    sessionStorage.setItem("referrerUrl", window.location.href)
+  }
+
+  backIfSamePath(event) {
+    const link = event.target.closest("a")
+    const targetUrl = new URL(link.href)
+
+    if (this.#referrerPath && targetUrl.pathname === this.#referrerPath) {
+      event.preventDefault()
+      Turbo.visit(this.#referrerUrl)
+    }
+  }
+  get #referrerPath() {
+    if (!this.#referrerUrl) return null
+    return new URL(this.#referrerUrl).pathname
+  }
+
+  get #referrerUrl() {
+    return sessionStorage.getItem("referrerUrl")
+  }
+}