refactor(mcp): improve form modal layout with adaptive height editor

Restructure MCP form modal for better space utilization.
- Split form into upper form fields and lower JSON editor sections
- Add full-height mode support for JsonEditor component
- Use flex layout for editor to fill available space
- Update PromptFormPanel to use full-height editor
- Fix locale text formatting

src/components/prompts/PromptFormPanel.tsx

@@ -142,7 +142,7 @@ const PromptFormPanel: React.FC<PromptFormPanelProps> = ({
             onChange={setContent}
             placeholder={t("prompts.contentPlaceholder", { filename })}
             darkMode={isDarkMode}
-            minHeight="500px"
+            minHeight="167px"
           />
         </div>
       </div>