Feat: conversation variable & variable assigner node (#7222)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: Joel <iamjoel007@gmail.com>
Co-authored-by: -LAN- <laipz8200@outlook.com>

web/app/components/base/prompt-editor/index.tsx

@@ -144,7 +144,7 @@ const PromptEditor: FC<PromptEditorProps> = ({
 
   return (
     <LexicalComposer initialConfig={{ ...initialConfig, editable }}>
-      <div className='relative h-full'>
+      <div className='relative min-h-5'>
         <RichTextPlugin
           contentEditable={<ContentEditable className={`${className} outline-none ${compact ? 'leading-5 text-[13px]' : 'leading-6 text-sm'} text-gray-700`} style={style || {}} />}
           placeholder={<Placeholder value={placeholder} className={placeholderClassName} compact={compact} />}