diff --git a/src/claire/web/app/.gitignore b/src/claire/web/app/.gitignore
new file mode 100644
index 0000000..75ccfbe
--- /dev/null
+++ b/src/claire/web/app/.gitignore
@@ -0,0 +1,9 @@
+node_modules
+dist
+*.local
+.vite
+
+# transpiler output — sources are .ts/.tsx, Vite bundles them directly
+src/**/*.js
+vite.config.js
+tsconfig.tsbuildinfo
diff --git a/src/claire/web/app/tsconfig.json b/src/claire/web/app/tsconfig.json
new file mode 100644
index 0000000..91c617d
--- /dev/null
+++ b/src/claire/web/app/tsconfig.json
@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "verbatimModuleSyntax": true,
+    "resolveJsonModule": true,
+    "useDefineForClassFields": true,
+    "types": ["vite/client"]
+  },
+  "include": ["src", "vite.config.ts"]
+}
diff --git a/src/claire/web/app/vite.config.ts b/src/claire/web/app/vite.config.ts
new file mode 100644
index 0000000..889ccca
--- /dev/null
+++ b/src/claire/web/app/vite.config.ts
@@ -0,0 +1,35 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+// Claire's FastAPI runs on :8767 (configured in ~/.config/claire/claire.toml).
+// In dev, Vite serves the SPA on :5173 and proxies the JSON API + SSE +
+// MCP routes back to FastAPI so the React app can hit relative URLs.
+const FASTAPI_TARGET = "http://127.0.0.1:8767";
+
+export default defineConfig({
+  plugins: [react()],
+  // @lilith/ui-charts pulls @lilith/ui-styled-components, which resolves a
+  // second styled-components copy (6.3.x vs the app's 6.4.x). Two copies =
+  // a broken ThemeProvider context. Force a single instance.
+  resolve: {
+    dedupe: ["styled-components", "react", "react-dom"],
+  },
+  server: {
+    port: 5173,
+    proxy: {
+      "/api": { target: FASTAPI_TARGET, changeOrigin: true },
+      // SSE — must NOT buffer. Vite's default for /chat/stream is fine
+      // because http-proxy forwards as-is, but be explicit so the path
+      // doesn't get caught by a future catch-all.
+      "/chat/stream": { target: FASTAPI_TARGET, changeOrigin: true },
+      "/mcp": { target: FASTAPI_TARGET, changeOrigin: true, ws: true },
+    },
+  },
+  build: {
+    // Built assets land in dist/; FastAPI mounts this directory as static
+    // in production (see R2 milestone).
+    outDir: "dist",
+    emptyOutDir: true,
+    sourcemap: true,
+  },
+});
diff --git a/src/clare/web/app/vite.config.js b/src/clare/web/app/vite.config.js
deleted file mode 100644
index fc674ff..0000000
--- a/src/clare/web/app/vite.config.js
+++ /dev/null
@@ -1,33 +0,0 @@
-import { defineConfig } from "vite";
-import react from "@vitejs/plugin-react";
-// Clare's FastAPI runs on :8767 (configured in ~/.config/clare/clare.toml).
-// In dev, Vite serves the SPA on :5173 and proxies the JSON API + SSE +
-// MCP routes back to FastAPI so the React app can hit relative URLs.
-const FASTAPI_TARGET = "http://127.0.0.1:8767";
-export default defineConfig({
-    plugins: [react()],
-    // @lilith/ui-charts pulls @lilith/ui-styled-components, which resolves a
-    // second styled-components copy (6.3.x vs the app's 6.4.x). Two copies =
-    // a broken ThemeProvider context. Force a single instance.
-    resolve: {
-        dedupe: ["styled-components", "react", "react-dom"],
-    },
-    server: {
-        port: 5173,
-        proxy: {
-            "/api": { target: FASTAPI_TARGET, changeOrigin: true },
-            // SSE — must NOT buffer. Vite's default for /chat/stream is fine
-            // because http-proxy forwards as-is, but be explicit so the path
-            // doesn't get caught by a future catch-all.
-            "/chat/stream": { target: FASTAPI_TARGET, changeOrigin: true },
-            "/mcp": { target: FASTAPI_TARGET, changeOrigin: true, ws: true },
-        },
-    },
-    build: {
-        // Built assets land in dist/; FastAPI mounts this directory as static
-        // in production (see R2 milestone).
-        outDir: "dist",
-        emptyOutDir: true,
-        sourcemap: true,
-    },
-});