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/Livewire/QuickSwitcher.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace App\Livewire;
+
+use App\Models\Document;
+use App\Services\DocumentService;
+use Livewire\Component;
+use Livewire\Attributes\Computed;
+
+class QuickSwitcher extends Component
+{
+    public $search = '';
+    public $selectedIndex = 0;
+
+    #[Computed]
+    public function results()
+    {
+        if (empty($this->search)) {
+            return Document::select('id', 'title', 'slug', 'path', 'updated_at')
+                ->orderBy('updated_at', 'desc')
+                ->limit(10)
+                ->get()
+                ->map(fn($doc) => [
+                    'id' => $doc->id,
+                    'title' => $doc->title,
+                    'slug' => $doc->slug,
+                    'directory' => dirname($doc->path),
+                ])
+                ->toArray();
+        }
+
+        // FULLTEXT検索を使用（日本語対応）
+        $results = Document::select('id', 'title', 'slug', 'path', 'updated_at')
+            ->whereRaw('MATCH(title, content) AGAINST(? IN BOOLEAN MODE)', [$this->search])
+            ->orderBy('updated_at', 'desc')
+            ->limit(10)
+            ->get()
+            ->map(fn($doc) => [
+                'id' => $doc->id,
+                'title' => $doc->title,
+                'slug' => $doc->slug,
+                'directory' => dirname($doc->path),
+            ])
+            ->toArray();
+
+        // FULLTEXT検索で結果がない場合は LIKE 検索にフォールバック
+        if (empty($results)) {
+            $results = Document::select('id', 'title', 'slug', 'path', 'updated_at')
+                ->where(function($query) {
+                    $query->where('title', 'like', '%' . $this->search . '%')
+                          ->orWhere('content', 'like', '%' . $this->search . '%');
+                })
+                ->orderBy('updated_at', 'desc')
+                ->limit(10)
+                ->get()
+                ->map(fn($doc) => [
+                    'id' => $doc->id,
+                    'title' => $doc->title,
+                    'slug' => $doc->slug,
+                    'directory' => dirname($doc->path),
+                ])
+                ->toArray();
+        }
+
+        return $results;
+    }
+
+    public function updated($propertyName)
+    {
+        if ($propertyName === 'search') {
+            $this->selectedIndex = 0;
+        }
+    }
+
+    public function selectNext()
+    {
+        $results = $this->results;
+        if ($this->selectedIndex < count($results) - 1) {
+            $this->selectedIndex++;
+        }
+    }
+
+    public function selectPrevious()
+    {
+        if ($this->selectedIndex > 0) {
+            $this->selectedIndex--;
+        }
+    }
+
+    public function selectDocument()
+    {
+        $results = $this->results;
+        if (isset($results[$this->selectedIndex])) {
+            $document = $results[$this->selectedIndex];
+
+            // id が存在することを確認
+            if (!empty($document['id'])) {
+                return $this->redirect(route('documents.show', $document['id']));
+            }
+        }
+    }
+
+    public function render()
+    {
+        return view('livewire.quick-switcher');
+    }
+}