Implement ID-based routing and folder auto-generation from titles

Major features:
- Switch from slug-based to ID-based routing (/documents/123)
- Enable title editing with automatic slug/path regeneration
- Auto-generate folder structure from title slashes (e.g., Laravel/Livewire/Components)
- Persist sidebar folder open/close state using localStorage
- Remove slug unique constraint (ID routing makes it unnecessary)
- Implement recursive tree view with multi-level folder support

Architecture changes:
- DocumentService: Add generatePathAndSlug() for title-based path generation
- Routes: Change from {document:slug} to {document} for ID binding
- SidebarTree: Extract recursive rendering to partials/tree-item.blade.php
- Database: Remove unique constraint from documents.slug column

UI improvements:
- Display only last path component in sidebar (Components vs Laravel/Livewire/Components)
- Folder state persists across page navigation via localStorage
- Title field accepts slashes for folder organization

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/app/Http/Controllers/ProfileController.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Http\Requests\ProfileUpdateRequest;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Redirect;
+use Illuminate\View\View;
+
+class ProfileController extends Controller
+{
+    /**
+     * Display the user's profile form.
+     */
+    public function edit(Request $request): View
+    {
+        return view('profile.edit', [
+            'user' => $request->user(),
+        ]);
+    }
+
+    /**
+     * Update the user's profile information.
+     */
+    public function update(ProfileUpdateRequest $request): RedirectResponse
+    {
+        $request->user()->fill($request->validated());
+
+        if ($request->user()->isDirty('email')) {
+            $request->user()->email_verified_at = null;
+        }
+
+        $request->user()->save();
+
+        return Redirect::route('profile.edit')->with('status', 'profile-updated');
+    }
+
+    /**
+     * Delete the user's account.
+     */
+    public function destroy(Request $request): RedirectResponse
+    {
+        $request->validateWithBag('userDeletion', [
+            'password' => ['required', 'current_password'],
+        ]);
+
+        $user = $request->user();
+
+        Auth::logout();
+
+        $user->delete();
+
+        $request->session()->invalidate();
+        $request->session()->regenerateToken();
+
+        return Redirect::to('/');
+    }
+}