fix(core): update prompts (#6693)

update based on latest docs

packages/frontend/core/src/components/blocksuite/block-suite-editor/ai/prompt.ts

@@ -32,6 +32,7 @@ export const promptKeys = [
   'Make it real',
   'Make it longer',
   'Make it shorter',
+  'Continue writing',
 ] as const;
 
 export type PromptKey = (typeof promptKeys)[number];

packages/frontend/core/src/components/blocksuite/block-suite-editor/ai/provider.ts

@@ -308,6 +308,14 @@ export function setupAIProvider() {
       promptName,
     });
   });
+
+  provideAction('continueWriting', options => {
+    return textToText({
+      ...options,
+      content: options.input,
+      promptName: 'Continue writing',
+    });
+  });
   //#endregion
 
   AIProvider.provide('histories', {