diff --git a/.github/workflows/frontend-ci.yml b/.github/workflows/frontend-ci.yml
index 39e3325..c56285e 100644
--- a/.github/workflows/frontend-ci.yml
+++ b/.github/workflows/frontend-ci.yml
@@ -41,6 +41,29 @@ jobs:
         working-directory: frontend
         run: npm run test
 
+  build:
+    name: Build Frontend
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install dependencies
+        working-directory: frontend
+        run: npm ci
+
+      - name: Build frontend
+        working-directory: frontend
+        run: npm run build
+
   ui-tests:
     name: UI Tests
     runs-on: ubuntu-latest
diff --git a/frontend/src/components/review/__tests__/SourceCodeViewer.test.tsx b/frontend/src/components/review/__tests__/SourceCodeViewer.test.tsx
index f782325..4bae410 100644
--- a/frontend/src/components/review/__tests__/SourceCodeViewer.test.tsx
+++ b/frontend/src/components/review/__tests__/SourceCodeViewer.test.tsx
@@ -19,7 +19,7 @@ vi.mock("prism-react-renderer", () => ({
             tokens: code
                 .split("\n")
                 .map((line: string) => [{content: line, types: ["plain"]}]),
-            getLineProps: ({line}: any) => ({}),
+            getLineProps: (_lineProps: any) => ({}),
             getTokenProps: ({token}: any) => ({children: token.content}),
         }),
     themes: {nightOwl: {plain: {}}, github: {plain: {}}},
diff --git a/frontend/src/components/utils/__tests__/Toaster.test.tsx b/frontend/src/components/utils/__tests__/Toaster.test.tsx
index fea4349..c7f3106 100644
--- a/frontend/src/components/utils/__tests__/Toaster.test.tsx
+++ b/frontend/src/components/utils/__tests__/Toaster.test.tsx
@@ -2,7 +2,21 @@ import {render, screen} from "@testing-library/react";
 import {beforeEach, describe, expect, it, vi} from "vitest";
 import {Toaster} from "../Toaster";
 
-const mockSonner = vi.hoisted(() => vi.fn(() => <div data-testid="sonner" />));
+type SonnerProps = {
+    className?: string;
+    position?: string;
+    toastOptions?: {
+        classNames?: {
+            toast?: string;
+            success?: string;
+            error?: string;
+        };
+    };
+};
+
+const mockSonner = vi.hoisted(() =>
+    vi.fn((_props: SonnerProps) => <div data-testid="sonner" />),
+);
 
 vi.mock("sonner", () => ({
     Toaster: (props: any) => mockSonner(props),
@@ -19,7 +33,12 @@ describe("Toaster", () => {
         expect(screen.getByTestId("sonner")).toBeInTheDocument();
         expect(mockSonner).toHaveBeenCalledTimes(1);
 
-        const sonnerProps = mockSonner.mock.calls[0][0];
+        const sonnerProps = mockSonner.mock.calls[0]?.[0];
+        expect(sonnerProps).toBeDefined();
+        if (!sonnerProps) {
+            throw new Error("Expected Sonner to be called with props");
+        }
+
         expect(sonnerProps.className).toBe("toaster group");
         expect(sonnerProps.position).toBe("bottom-right");
         expect(sonnerProps.toastOptions).toEqual(
diff --git a/frontend/src/hooks/mutations/__tests__/useAuthMutations.test.ts b/frontend/src/hooks/mutations/__tests__/useAuthMutations.test.ts
index d8bb5c1..645ab6f 100644
--- a/frontend/src/hooks/mutations/__tests__/useAuthMutations.test.ts
+++ b/frontend/src/hooks/mutations/__tests__/useAuthMutations.test.ts
@@ -121,14 +121,14 @@ describe("useAuthMutations", () => {
 
             await act(async () => {
                 result.current.mutate({
-                    old_password: "old",
+                    current_password: "old",
                     new_password: "new",
                 });
             });
 
             await waitFor(() => expect(result.current.isSuccess).toBe(true));
             expect(changePassword).toHaveBeenCalledWith({
-                old_password: "old",
+                current_password: "old",
                 new_password: "new",
             });
         });
@@ -142,7 +142,7 @@ describe("useAuthMutations", () => {
 
             await act(async () => {
                 result.current.mutate({
-                    old_password: "old",
+                    current_password: "old",
                     new_password: "new",
                 });
             });
diff --git a/frontend/src/routes/__tests__/-authRoute.test.ts b/frontend/src/routes/__tests__/-authRoute.test.ts
index 38c3225..5f92262 100644
--- a/frontend/src/routes/__tests__/-authRoute.test.ts
+++ b/frontend/src/routes/__tests__/-authRoute.test.ts
@@ -55,7 +55,9 @@ describe("routes/_auth beforeLoad", () => {
     it("redirects to /login when auth_token is missing", async () => {
         const {Route, ensureQueryDataMock} = await loadAuthRoute();
 
-        await expect(Route.options.beforeLoad?.()).rejects.toMatchObject({
+        await expect(
+            Route.options.beforeLoad?.({} as never),
+        ).rejects.toMatchObject({
             options: {to: "/login"},
         });
         expect(ensureQueryDataMock).not.toHaveBeenCalled();
@@ -66,7 +68,9 @@ describe("routes/_auth beforeLoad", () => {
         const {Route, queryKeysMock, ensureQueryDataMock, meMock} =
             await loadAuthRoute();
 
-        await expect(Route.options.beforeLoad?.()).resolves.toBeUndefined();
+        await expect(
+            Route.options.beforeLoad?.({} as never),
+        ).resolves.toBeUndefined();
         expect(ensureQueryDataMock).toHaveBeenCalledWith(
             expect.objectContaining({
                 queryKey: queryKeysMock.auth.me,
@@ -82,6 +86,8 @@ describe("routes/_auth beforeLoad", () => {
         const authError = new Error("me query failed");
         meMock.mockRejectedValueOnce(authError);
 
-        await expect(Route.options.beforeLoad?.()).rejects.toBe(authError);
+        await expect(Route.options.beforeLoad?.({} as never)).rejects.toBe(
+            authError,
+        );
     });
 });
diff --git a/frontend/src/routes/__tests__/-redirectRoutes.test.ts b/frontend/src/routes/__tests__/-redirectRoutes.test.ts
index 2eaae86..c495b6c 100644
--- a/frontend/src/routes/__tests__/-redirectRoutes.test.ts
+++ b/frontend/src/routes/__tests__/-redirectRoutes.test.ts
@@ -5,7 +5,7 @@ import {Route as ProjectIndexRoute} from "../_auth/project/$projectId/index";
 describe("redirect-only routes", () => {
     it("redirects /_auth/ to /dashboard", async () => {
         await expect(
-            (async () => AuthIndexRoute.options.beforeLoad?.())(),
+            (async () => AuthIndexRoute.options.beforeLoad?.({} as never))(),
         ).rejects.toMatchObject({
             options: {to: "/dashboard"},
         });
@@ -13,7 +13,7 @@ describe("redirect-only routes", () => {
 
     it("redirects /_auth/project/$projectId/ to /dashboard with replace", async () => {
         await expect(
-            (async () => ProjectIndexRoute.options.beforeLoad?.())(),
+            (async () => ProjectIndexRoute.options.beforeLoad?.({} as never))(),
         ).rejects.toMatchObject({
             options: {
                 to: "/dashboard",