fix(chat): AT feature shouldn't turn on during SourceCodeBrowser (#3752)

* fix(chat): add type annotations for suggestion handling and improve conditional rendering

* feat(chat): allow dynamic mention suggestions based on workspace files

* refactor(chat): remove unused Editor import and simplify mention suggestion logic

* fix(chat): enhance mention suggestion logic to consider content match in editor state

* refactor(chat): simplify async function parameters and improve readability in prompt form

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

ee/tabby-ui/components/chat/prompt-form.tsx

@@ -5,18 +5,22 @@ import React, {
   useImperativeHandle
 } from 'react'
 import Document from '@tiptap/extension-document'
+import Mention from '@tiptap/extension-mention'
 import Paragraph from '@tiptap/extension-paragraph'
 import Placeholder from '@tiptap/extension-placeholder'
 import Text from '@tiptap/extension-text'
 import {
+  Editor,
   EditorContent,
   Extension,
+  Range,
   ReactRenderer,
   useEditor
 } from '@tiptap/react'
 
 import './prompt-form.css'
 
+import { EditorState } from '@tiptap/pm/state'
 import { isEqual } from 'lodash-es'
 import { EditorFileContext } from 'tabby-chat-panel/index'
 import tippy, { GetReferenceClientRect, Instance } from 'tippy.js'
@@ -89,6 +93,21 @@ function PromptFormRenderer(
           deleteTriggerWithBackspace: true,
           // Customize how mention suggestions are fetched and rendered
           suggestion: {
+            allow: ({
+              state,
+              range
+            }: {
+              editor: Editor
+              state: EditorState
+              range: Range
+              isActive?: boolean
+            }) => {
+              const $from = state.doc.resolve(range.from)
+              const type = state.schema.nodes[Mention.name]
+              const allow = !!$from.parent.type.contentMatch.matchType(type)
+
+              return !!listFileInWorkspace && allow
+            },
             char: '@', // Trigger character for mention
             items: async ({ query }) => {
               if (!listFileInWorkspace) return []
@@ -255,7 +274,7 @@ function PromptFormRenderer(
         </span>
         <div
           className="max-h-32 flex-1 overflow-y-auto py-4"
-          onClick={e => {
+          onClick={() => {
             if (editor && !editor.isFocused) {
               editor?.commands.focus()
             }