feat: Implement chat functionality

app/Http/Controllers/DynamicController.php

@@ -46,7 +46,7 @@ class DynamicController extends Controller
     {
         $this->authorize('view', $dynamic);
 
-        $dynamic->load('ledgers', 'participants');
+        $dynamic->load('ledgers', 'participants', 'chat.messages.user');
 
         return Inertia::render('Dynamics/Show', [
             'dynamic' => $dynamic,

app/Http/Controllers/LedgerController.php

@@ -43,7 +43,7 @@ class LedgerController extends Controller
     {
         $this->authorize('view', $ledger);
 
-        $ledger->load('mutations.user');
+        $ledger->load('mutations.user', 'mutations.chat.messages.user');
 
         return Inertia::render('Ledgers/Show', [
             'dynamic' => $dynamic,

app/Http/Controllers/MessageController.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\StoreMessageRequest;
+use App\Models\Chat;
+use App\Models\Message;
+use Illuminate\Http\Request;
+
+class MessageController extends Controller
+{
+    /**
+     * Display a listing of the resource.
+     */
+    public function index()
+    {
+        //
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     */
+    public function create()
+    {
+        //
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     */
+    public function store(StoreMessageRequest $request, Chat $chat)
+    {
+        $chat->messages()->create([
+            ...$request->validated(),
+            'user_id' => $request->user()->id,
+        ]);
+
+        return redirect()->back();
+    }
+
+    /**
+     * Display the specified resource.
+     */
+    public function show(Message $message)
+    {
+        //
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     */
+    public function edit(Message $message)
+    {
+        //
+    }
+
+    /**
+     * Update the specified resource in storage.
+     */
+    public function update(Request $request, Message $message)
+    {
+        //
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     */
+    public function destroy(Message $message)
+    {
+        //
+    }
+}