chore: gitignore tsc -b build cache + vite.config emit

Build pipeline 'tsc -b && vite build' produces .tsbuildinfo + an
accidental vite.config.{js,d.ts} emit from project references.
Untrack + ignore so they don't keep coming back to dirty git status.

.gitignore

@@ -5,3 +5,9 @@ dist
 *.local
 .DS_Store
 *.swp
+
+# TypeScript build cache + accidental emit from vite.config (tsc -b)
+*.tsbuildinfo
+vite.config.d.ts
+vite.config.js
+vite.config.js.map

tsconfig.tsbuildinfo

@@ -1 +0,0 @@
-{"root":["./src/App.tsx","./src/api.ts","./src/auth.tsx","./src/main.tsx","./src/types.ts","./src/util.ts","./src/pages/AgentActivity.tsx","./src/pages/NotFound.tsx","./src/pages/TopicDetail.tsx","./src/pages/TopicList.tsx","./src/pages/Verdict.tsx"],"version":"5.9.3"}

vite.config.d.ts

@@ -1,2 +0,0 @@
-declare const _default: import("vite").UserConfig;
-export default _default;

vite.config.js

@@ -1,21 +0,0 @@
-import { defineConfig } from 'vite';
-import react from '@vitejs/plugin-react';
-// Dev server proxies /api → the dialectic-backend so the SPA can run
-// without CORS knobs at dev time. In prod the SPA + backend sit behind
-// the same hostname (nginx rewrites /api/ → backend container).
-export default defineConfig({
-    plugins: [react()],
-    server: {
-        port: 5173,
-        proxy: {
-            '/api': {
-                target: process.env.VITE_DIALECTIC_BACKEND ?? 'http://localhost:8090',
-                changeOrigin: false,
-            },
-        },
-    },
-    build: {
-        outDir: 'dist',
-        sourcemap: true,
-    },
-});