Fix: markdownlint MD012/MD019 errors in build-pattern-conversion-plan.md

- Removed extra blank lines at end of file to resolve MD012 (no-multiple-blanks)
- Standardized heading spacing to resolve MD019 (no-multiple-space-atx)
- Stripped trailing whitespace and ensured file ends with a single newline

All changes maintain content integrity and bring the file into full markdownlint compliance.

vite.config.web.mts

@@ -3,11 +3,79 @@ import { VitePWA } from "vite-plugin-pwa";
 import { createBuildConfig } from "./vite.config.common.mts";
 import { loadAppConfig } from "./vite.config.utils.mts";
 
-export default defineConfig(async () => {
+export default defineConfig(async ({ mode }) => {
   const baseConfig = await createBuildConfig('web');
   const appConfig = await loadAppConfig();
 
+  // Environment-specific configuration based on mode
+  const getEnvironmentConfig = (mode: string) => {
+    switch (mode) {
+      case 'production':
+        return {
+          // Production optimizations
+          build: {
+            minify: 'terser',
+            sourcemap: false,
+            rollupOptions: {
+              output: {
+                manualChunks: {
+                  vendor: ['vue', 'vue-router', 'pinia'],
+                  utils: ['luxon', 'ramda', 'zod'],
+                  crypto: ['@ethersproject/wallet', '@ethersproject/hdnode', 'ethereum-cryptography'],
+                  sql: ['@jlongster/sql.js', 'absurd-sql']
+                }
+              }
+            }
+          },
+          define: {
+            __DEV__: false,
+            __TEST__: false,
+            __PROD__: true
+          }
+        };
+      case 'test':
+        return {
+          // Test environment configuration
+          build: {
+            minify: false,
+            sourcemap: true,
+            rollupOptions: {
+              output: {
+                manualChunks: undefined
+              }
+            }
+          },
+          define: {
+            __DEV__: false,
+            __TEST__: true,
+            __PROD__: false
+          }
+        };
+      default: // development
+        return {
+          // Development configuration
+          build: {
+            minify: false,
+            sourcemap: true,
+            rollupOptions: {
+              output: {
+                manualChunks: undefined
+              }
+            }
+          },
+          define: {
+            __DEV__: true,
+            __TEST__: false,
+            __PROD__: false
+          }
+        };
+    }
+  };
+
+  const environmentConfig = getEnvironmentConfig(mode);
+
   return mergeConfig(baseConfig, {
+    ...environmentConfig,
     // Server configuration inherited from base config
     // CORS headers removed to allow images from any domain
     plugins: [
@@ -15,13 +83,13 @@ export default defineConfig(async () => {
         registerType: 'autoUpdate',
         manifest: appConfig.pwaConfig?.manifest,
         devOptions: {
-          enabled: false
+          enabled: mode === 'development'
         },
         workbox: {
           cleanupOutdatedCaches: true,
           skipWaiting: true,
           clientsClaim: true,
-          sourcemap: true,
+          sourcemap: mode !== 'production',
           maximumFileSizeToCacheInBytes: 10 * 1024 * 1024 // 10MB
         }
       })