fix(core): disable space ai guidance for non-paragraph block (#11847)

### TL;DR

Disable space ai guidance for non-paragraph block

> CLOSE AI-67

packages/frontend/core/src/blocksuite/ai/entries/space/setup-space.ts

@@ -27,7 +27,12 @@ export function setupSpaceAIEntry(panel: AffineAIPanelWidget) {
       const selection = host.selection.find(TextSelection);
       if (selection && selection.isCollapsed() && selection.from.index === 0) {
         const block = host.view.getBlock(selection.blockId);
-        if (!block?.model?.text || block.model.text?.length > 0) return;
+        if (
+          !block?.model?.text ||
+          block.model.text?.length > 0 ||
+          block.model.flavour !== 'affine:paragraph'
+        )
+          return;
 
         event.preventDefault();
         handleInlineAskAIAction(host);

tests/affine-cloud-copilot/e2e/basic/guidance.spec.ts

@@ -15,4 +15,24 @@ test.describe('AIBasic/Guidance', () => {
     await page.keyboard.press('Space');
     await expect(page.locator('affine-ai-panel-widget')).toBeVisible();
   });
+
+  test('should not show AI panel when space is pressed on non-empty paragraph', async ({
+    page,
+    utils,
+  }) => {
+    await utils.editor.focusToEditor(page);
+    await page.keyboard.insertText('HelloWorld');
+    await page.keyboard.press('Space');
+    await expect(page.locator('affine-ai-panel-widget')).not.toBeVisible();
+  });
+
+  test('should not show AI panel when space is pressed on non-paragraph block', async ({
+    page,
+    utils,
+  }) => {
+    await utils.editor.focusToEditor(page);
+    await page.keyboard.insertText('```js');
+    await page.keyboard.press('Enter');
+    await expect(page.locator('affine-ai-panel-widget')).not.toBeVisible();
+  });
 });