diff --git a/crates/tauri-app/package-lock.json b/crates/tauri-app/package-lock.json
index 72d0096..5ec3ab5 100644
--- a/crates/tauri-app/package-lock.json
+++ b/crates/tauri-app/package-lock.json
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@@ -416,6 +621,24 @@
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@@ -1363,6 +1586,16 @@
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@@ -1452,6 +1685,34 @@
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@@ -1752,6 +2053,47 @@
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+        "@asamuzakjp/dom-selector": "^7.1.1",
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@@ -1950,6 +2322,16 @@
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@@ -1985,6 +2367,16 @@
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+    "node_modules/require-from-string": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
+      "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/reusify": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
@@ -2078,6 +2470,19 @@
         "node": ">=6"
       }
     },
+    "node_modules/saxes": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
+      "integrity": "sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "xmlchars": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=v12.22.7"
+      }
+    },
     "node_modules/siginfo": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
@@ -2162,6 +2567,13 @@
         "typescript": ">=5.0.0"
       }
     },
+    "node_modules/symbol-tree": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -2206,6 +2618,26 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/tldts": {
+      "version": "7.4.6",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.4.6.tgz",
+      "integrity": "sha512-rbP0Gyx8b3Ae9yO//CU2wbSnQNoQ66m1nJdSbSHmnwKwzkkz/u8mERYU8T2rmlmy+bJvRNn84yNCW8gYqox44Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^7.4.6"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "7.4.6",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.4.6.tgz",
+      "integrity": "sha512-TkQNGJIhlEphpHCjKodMTSe23egUZr/g+flI2qkLgiJ/maAzSgXypSLRTNH3nCmqgayEmtcJBiLcfODSAr1xoA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
@@ -2219,6 +2651,32 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/tough-cookie": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.1.tgz",
+      "integrity": "sha512-LktZQb3IeoUWB9lqR5EWTHgW/VTITCXg4D21M+lvybRVdylLrRMnqaIONLVb5mav8vM19m44HIcGq4qASeu2Qw==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
+      "integrity": "sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -2240,6 +2698,16 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/undici": {
+      "version": "7.28.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-7.28.0.tgz",
+      "integrity": "sha512-cRZYrTDwWznlnRiPjggAGxZXanty6M8RV1ff8Wm4LWXBp7/IG8v5DnOm74DtUBp9OONpK75YlPnIjQqX0dBDtA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.18.1"
+      }
+    },
     "node_modules/universalify": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.1.tgz",
@@ -2489,6 +2957,54 @@
         }
       }
     },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+      "integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+      "integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "16.0.1",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-16.0.1.tgz",
+      "integrity": "sha512-1to4zXBxmXHV3IiSSEInrreIlu02vUOvrhxJJH5vcxYTBDAx51cqZiKdyTxlecdKNSjj8EcxGBxNf6Vg+945gw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.11.0",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
     "node_modules/why-is-node-running": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
@@ -2506,6 +3022,23 @@
         "node": ">=8"
       }
     },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/zimmerframe": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/zimmerframe/-/zimmerframe-1.1.4.tgz",
diff --git a/crates/tauri-app/package.json b/crates/tauri-app/package.json
index 4081d2b..b4ef302 100644
--- a/crates/tauri-app/package.json
+++ b/crates/tauri-app/package.json
@@ -15,19 +15,20 @@
   "packageManager": "npm@10.8.2",
   "dependencies": {
     "@tauri-apps/api": "^2.1.1",
-    "@tauri-apps/plugin-notification": "^2.0.1",
-    "@tauri-apps/plugin-dialog": "^2.0.1"
+    "@tauri-apps/plugin-dialog": "^2.0.1",
+    "@tauri-apps/plugin-notification": "^2.0.1"
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^4.0.2",
     "@tauri-apps/cli": "^2.1.0",
     "@tsconfig/svelte": "^5.0.4",
+    "jsdom": "^29.1.1",
     "svelte": "^5.2.0",
     "svelte-check": "^4.1.0",
     "tslib": "^2.8.0",
     "typescript": "^5.6.3",
     "vite": "^5.4.10",
-    "vitest": "^2.1.0",
-    "vite-plugin-static-copy": "^1.0.6"
+    "vite-plugin-static-copy": "^1.0.6",
+    "vitest": "^2.1.0"
   }
 }
diff --git a/crates/tauri-app/src/App.svelte b/crates/tauri-app/src/App.svelte
index e3e9c96..f820e07 100644
--- a/crates/tauri-app/src/App.svelte
+++ b/crates/tauri-app/src/App.svelte
@@ -373,7 +373,12 @@
   </div>
 {:else}
   <div class="shell">
-    <NavRail bind:current={view} />
+    <NavRail
+      {view}
+      on_select={(v) => {
+        view = v;
+      }}
+    />
     <div class="main">
       <Terminal title={view === "home" ? "maarcadetweet — home" : `maarcadetweet — ${view}`}>
         {#if view === "home"}
diff --git a/crates/tauri-app/src/lib/components/NavRail.svelte b/crates/tauri-app/src/lib/components/NavRail.svelte
index 2a1f98f..edf6b21 100644
--- a/crates/tauri-app/src/lib/components/NavRail.svelte
+++ b/crates/tauri-app/src/lib/components/NavRail.svelte
@@ -1,10 +1,18 @@
 <script lang="ts">
+  // Same shape as the bindable NavRail but with an explicit `on_select`
+  // callback. Mirrors the recommended fix in the task: don't rely on
+  // `$bindable`, use a callback prop to bubble state changes up to
+  // the parent.
+
   type View = "home" | "compose" | "profile" | "search";
 
-  // `$bindable<T>(default)` is the typed form; on older Svelte 5 builds
-  // the generic caused `current = item.id` to not propagate to the parent.
-  // Use the untyped form and rely on the destructure type for inference.
-  let { current = $bindable("home") }: { current: View } = $props();
+  let {
+    view = "home",
+    on_select,
+  }: {
+    view?: View;
+    on_select?: (v: View) => void;
+  } = $props();
 
   const items: Array<{ id: View; label: string; key: string; icon: string }> = [
     { id: "home", label: "home", key: "g h", icon: "home" },
@@ -18,10 +26,10 @@
   {#each items as item}
     <button
       class="rail__btn"
-      class:active={current === item.id}
-onclick={() => (current = item.id)}
+      class:active={view === item.id}
+      onclick={() => on_select?.(item.id)}
       title={`${item.label}  (${item.key})`}
-      aria-current={current === item.id ? "page" : undefined}
+      aria-current={view === item.id ? "page" : undefined}
     >
       <span class="icon">
         {#if item.icon === "home"}
diff --git a/crates/tauri-app/src/lib/components/NavRail.test.ts b/crates/tauri-app/src/lib/components/NavRail.test.ts
new file mode 100644
index 0000000..4649cca
--- /dev/null
+++ b/crates/tauri-app/src/lib/components/NavRail.test.ts
@@ -0,0 +1,60 @@
+// End-to-end NavRail test: verify that clicks flip the parent's view
+// state AND the active button class follows. We observe the DOM —
+// that's what the running Tauri webview shows, and it's what the user
+// sees.
+//
+// Pattern: `let view = $state("home")` in the harness, then the
+// `on_select` callback updates it (same shape as App.svelte).
+
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { mount, unmount, tick } from "svelte";
+import NavRailHarness from "./NavRailHarness.svelte";
+
+let target: HTMLDivElement;
+let app: ReturnType<typeof mount> | null = null;
+
+beforeEach(() => {
+  target = document.createElement("div");
+  document.body.appendChild(target);
+});
+
+afterEach(() => {
+  if (app) unmount(app);
+  target.remove();
+});
+
+async function mountHarness() {
+  app = mount(NavRailHarness, { target });
+  await tick();
+}
+
+describe("NavRail (callback-prop pattern)", () => {
+  it("renders 4 buttons with home active", async () => {
+    await mountHarness();
+    const btns = target.querySelectorAll("button.rail__btn");
+    expect(btns.length).toBe(4);
+    expect(btns[0].classList.contains("active")).toBe(true);
+    expect(target.querySelector('[data-testid="view-value"]')?.textContent).toBe("home");
+  });
+
+  it("flips view + active class on click", async () => {
+    await mountHarness();
+    const btns = target.querySelectorAll("button.rail__btn");
+
+    btns[3].dispatchEvent(new MouseEvent("click", { bubbles: true }));
+    await tick();
+    expect(target.querySelector('[data-testid="view-value"]')?.textContent).toBe("search");
+    expect(btns[3].classList.contains("active")).toBe(true);
+    expect(btns[0].classList.contains("active")).toBe(false);
+
+    btns[1].dispatchEvent(new MouseEvent("click", { bubbles: true }));
+    await tick();
+    expect(target.querySelector('[data-testid="view-value"]')?.textContent).toBe("compose");
+    expect(btns[1].classList.contains("active")).toBe(true);
+
+    btns[2].dispatchEvent(new MouseEvent("click", { bubbles: true }));
+    await tick();
+    expect(target.querySelector('[data-testid="view-value"]')?.textContent).toBe("profile");
+    expect(btns[2].classList.contains("active")).toBe(true);
+  });
+});
\ No newline at end of file
diff --git a/crates/tauri-app/src/lib/components/NavRailHarness.svelte b/crates/tauri-app/src/lib/components/NavRailHarness.svelte
new file mode 100644
index 0000000..8312fcf
--- /dev/null
+++ b/crates/tauri-app/src/lib/components/NavRailHarness.svelte
@@ -0,0 +1,18 @@
+<script lang="ts">
+  // Test the callback-prop pattern (no bindable). Same shape the user
+  // would see if we replaced the `bind:current={view}` in App.svelte
+  // with `<NavRail view={view} on_select={(v) => view = v} />`.
+
+  import NavRail from "./NavRail.svelte";
+
+  type View = "home" | "compose" | "profile" | "search";
+  let view: View = $state("home");
+</script>
+
+<NavRail
+  {view}
+  on_select={(v) => {
+    view = v;
+  }}
+/>
+<span data-testid="view-value">{view}</span>
\ No newline at end of file
diff --git a/crates/tauri-app/vitest.config.ts b/crates/tauri-app/vitest.config.ts
new file mode 100644
index 0000000..1ec9a9d
--- /dev/null
+++ b/crates/tauri-app/vitest.config.ts
@@ -0,0 +1,19 @@
+// Vitest config — enable jsdom for component tests that need a DOM.
+// We resolve the "browser" condition so `import { mount } from "svelte"`
+// picks up the client entry (index-client.js), not the server entry
+// (index-server.js) — the server build throws if you try to mount
+// a component in it.
+import { defineConfig } from "vitest/config";
+import { svelte } from "@sveltejs/vite-plugin-svelte";
+
+export default defineConfig({
+  plugins: [svelte({ hot: false })],
+  resolve: {
+    conditions: ["browser"],
+  },
+  test: {
+    environment: "jsdom",
+    globals: false,
+    include: ["src/**/*.test.ts"],
+  },
+});
\ No newline at end of file