Fix AI chat streaming persistence when command menu closes (#14854)

Closes [#1583](https://github.com/twentyhq/core-team-issues/issues/1583)


- Removed `messageId` column from `File` table and its references in
code (unrelated to this PR)
- Updated AI chat to use React Context API with persistent provider in
`CommandMenuContainer`
- Converted all AI chat component states to regular Recoil atoms (no
instance context needed)

---------

Co-authored-by: Félix Malfait <felix@twenty.com>

packages/twenty-front/src/modules/command-menu/components/CommandMenuContainer.tsx

@@ -1,4 +1,5 @@
 import { ActionMenuComponentInstanceContext } from '@/action-menu/states/contexts/ActionMenuComponentInstanceContext';
+import { AgentChatProvider } from '@/ai/components/AgentChatProvider';
 import { CommandMenuOpenContainer } from '@/command-menu/components/CommandMenuOpenContainer';
 import { COMMAND_MENU_COMPONENT_INSTANCE_ID } from '@/command-menu/constants/CommandMenuComponentInstanceId';
 import { useCommandMenuCloseAnimationCompleteCleanup } from '@/command-menu/hooks/useCommandMenuCloseAnimationCompleteCleanup';
@@ -55,14 +56,16 @@ export const CommandMenuContainer = ({
         <ActionMenuComponentInstanceContext.Provider
           value={{ instanceId: COMMAND_MENU_COMPONENT_INSTANCE_ID }}
         >
-          <AnimatePresence
-            mode="wait"
-            onExitComplete={commandMenuCloseAnimationCompleteCleanup}
-          >
-            {isCommandMenuOpened && (
-              <CommandMenuOpenContainer>{children}</CommandMenuOpenContainer>
-            )}
-          </AnimatePresence>
+          <AgentChatProvider>
+            <AnimatePresence
+              mode="wait"
+              onExitComplete={commandMenuCloseAnimationCompleteCleanup}
+            >
+              {isCommandMenuOpened && (
+                <CommandMenuOpenContainer>{children}</CommandMenuOpenContainer>
+              )}
+            </AnimatePresence>
+          </AgentChatProvider>
         </ActionMenuComponentInstanceContext.Provider>
       </ContextStoreComponentInstanceContext.Provider>
     </RecordComponentInstanceContextsWrapper>