feat: add export conversation to image, markdown, and HTML formats

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pnpm-lock.yaml

@@ -80,6 +80,9 @@ importers:
       date-fns:
         specifier: ^4.1.0
         version: 4.1.0
+      html-to-image:
+        specifier: ^1.11.13
+        version: 1.11.13
       ignore:
         specifier: ^7.0.5
         version: 7.0.5
@@ -4200,6 +4203,9 @@ packages:
     resolution: {integrity: sha512-Eaw2YTGM6WOxA6CXbckaEvslr2Ne4NFsKrvc0v97JD5awbmeBLO5w9Ho9L9kmKonrwF9RJlW6BxT1PVv/agBHQ==}
     engines: {node: '>=16.9.0'}
 
+  html-to-image@1.11.13:
+    resolution: {integrity: sha512-cuOPoI7WApyhBElTTb9oqsawRvZ0rHhaHwghRLlTuffoD1B2aDemlCruLeZrUIIdvG7gs9xeELEPm6PhuASqrg==}
+
   html-url-attributes@3.0.1:
     resolution: {integrity: sha512-ol6UPyBWqsrO6EJySPz2O7ZSr856WDrEzM5zMqp+FJJLGMW35cLYmmZnl0vztAZxRUoNZJFTCohfjuIJ8I4QBQ==}
 
@@ -11108,6 +11114,8 @@ snapshots:
 
   hono@4.11.9: {}
 
+  html-to-image@1.11.13: {}
+
   html-url-attributes@3.0.1: {}
 
   html-void-elements@3.0.0: {}