feat(studio): /studio content table + bulk visibility / bulk delete

Skeleton for the creator studio surface deferred since Phase 6. The
/studio route lands on a filterable table of the signed-in user's
videos — All / Public / Unlisted / Private / Shorts / Processing-or-
Failed — with headline totals (public / unlisted / private counts,
processing + failed, total views) in a stat strip above.

Each row shows thumbnail + title + stripped description preview +
visibility badge + per-video totals. Row-level checkboxes raise a
toolbar when any row is selected; the toolbar supports:
  - Change visibility across the selection (any of the three visibility
    enums).
  - Delete the selection with a confirm prompt.

Server-side the bulk endpoints owner-filter by Auth::id() so a crafted
request body can't flip or delete anyone else's videos. Response is
JSON { updated | deleted : N } so the page can reload / toast cleanly.

Sidebar now carries a persistent "Studio" link under the You section
alongside History / Liked Videos.

Analytics, stepped upload (Details → Visibility), and schedule remain
future work — this ships the content management surface, nothing else.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

app/Http/Controllers/StudioController.php

@@ -0,0 +1,98 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Video;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+/**
+ * Creator studio — the content management surface YouTube calls "YouTube
+ * Studio". A skeleton for now: a filterable table of the signed-in user's
+ * videos plus a bulk visibility change endpoint. Analytics, stepped upload
+ * and schedule are future work.
+ */
+class StudioController extends Controller
+{
+    public function __construct()
+    {
+        $this->middleware('auth');
+    }
+
+    /**
+     * The studio dashboard — defaults to the content tab.
+     */
+    public function index(Request $request)
+    {
+        $user   = Auth::user();
+        $filter = $request->get('filter', 'all');
+
+        $query = Video::where('user_id', $user->id)->latest();
+
+        switch ($filter) {
+            case 'public':    $query->where('visibility', 'public'); break;
+            case 'unlisted':  $query->where('visibility', 'unlisted'); break;
+            case 'private':   $query->where('visibility', 'private'); break;
+            case 'shorts':    $query->where('is_shorts', true); break;
+            case 'draft':     $query->whereIn('status', ['pending', 'processing', 'failed']); break;
+        }
+
+        $videos = $query->paginate(24)->withQueryString();
+
+        // Headline numbers for the top bar.
+        $totals = [
+            'total'       => Video::where('user_id', $user->id)->count(),
+            'public'      => Video::where('user_id', $user->id)->where('visibility', 'public')->count(),
+            'unlisted'    => Video::where('user_id', $user->id)->where('visibility', 'unlisted')->count(),
+            'private'     => Video::where('user_id', $user->id)->where('visibility', 'private')->count(),
+            'processing'  => Video::where('user_id', $user->id)->whereIn('status', ['pending', 'processing'])->count(),
+            'failed'      => Video::where('user_id', $user->id)->where('status', 'failed')->count(),
+            'total_views' => \DB::table('video_views')
+                ->whereIn('video_id', Video::where('user_id', $user->id)->pluck('id'))
+                ->count(),
+        ];
+
+        return view('studio.index', [
+            'videos' => $videos,
+            'filter' => $filter,
+            'totals' => $totals,
+        ]);
+    }
+
+    /**
+     * Bulk visibility change. POSTs { video_ids: [...], visibility: '...' }.
+     * Guards against setting visibility on videos the user doesn't own, so a
+     * crafted request can't flip anyone else's content.
+     */
+    public function bulkVisibility(Request $request)
+    {
+        $request->validate([
+            'video_ids'   => ['required', 'array', 'min:1'],
+            'video_ids.*' => ['integer'],
+            'visibility'  => ['required', 'in:public,unlisted,private'],
+        ]);
+
+        $updated = Video::whereIn('id', $request->video_ids)
+            ->where('user_id', Auth::id())
+            ->update(['visibility' => $request->visibility]);
+
+        return response()->json(['updated' => $updated]);
+    }
+
+    /**
+     * Bulk delete. Same owner-only guard as above.
+     */
+    public function bulkDelete(Request $request)
+    {
+        $request->validate([
+            'video_ids'   => ['required', 'array', 'min:1'],
+            'video_ids.*' => ['integer'],
+        ]);
+
+        $deleted = Video::whereIn('id', $request->video_ids)
+            ->where('user_id', Auth::id())
+            ->delete();
+
+        return response()->json(['deleted' => $deleted]);
+    }
+}