feat(shorts): comments side panel (desktop) / bottom sheet (mobile)

The comments icon on each Short used to open the full /videos/{id}
page, kicking the viewer out of the vertical feed. Now it opens a
shared side drawer on desktop (right edge, 420px wide, starts below
the header) or a bottom sheet on mobile (70vh, slides up from the
bottom nav), without leaving the feed.

Content is the same resources/views/components/video-comments
section rendered on the watch page — fetched as XHR and the whole
#ytcSection node is lifted into the pane. All the existing comment
features (replies, likes, translate, heart/pin, permalinks) work
identically because we're reusing the exact same DOM.

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

resources/views/videos/shorts.blade.php

@@ -387,11 +387,14 @@
             <span class="short-action-label" id="like-count-{{ $vKey }}">{{ number_format($video->like_count) }}</span>
         </button>
 
-        {{-- Comments --}}
-        <a class="short-action-btn" href="{{ route('videos.show', $video) }}#comments">
-            <div class="short-action-icon"><i class="bi bi-chat-fill"></i></div>
+        {{-- Comments — opens the side panel on desktop, bottom sheet on
+             mobile (CSS does the breakpoint; the button toggles a shared
+             .shorts-comments-pane element populated via fetch). --}}
+        <button type="button" class="short-action-btn"
+                onclick="shortOpenComments('{{ $video->getRouteKey() }}')">
+            <div class="short-action-icon"><i class="bi bi-chat-fill" aria-hidden="true"></i></div>
             <span class="short-action-label">{{ number_format($video->comments()->count()) }}</span>
-        </a>
+        </button>
 
         {{-- Share --}}
         <button class="short-action-btn" onclick="shortShare('{{ $vKey }}', {{ json_encode($video->title) }})">
@@ -426,6 +429,68 @@
 
 @endforelse
 
+{{-- Shared comments pane: side drawer on desktop, bottom sheet on mobile.
+     Populated via fetch of the regular watch page's #ytcSection block so
+     all the comment features (likes, replies, translate, heart/pin) work
+     identically. --}}
+<div id="shortsCommentsPane" class="shorts-comments-pane" aria-hidden="true">
+    <div class="shorts-comments-head">
+        <span>Comments</span>
+        <button type="button" class="shorts-comments-close" onclick="shortCloseComments()" aria-label="Close comments">
+            <i class="bi bi-x-lg" aria-hidden="true"></i>
+        </button>
+    </div>
+    <div class="shorts-comments-body" id="shortsCommentsBody">
+        <div class="shorts-comments-loading">Loading…</div>
+    </div>
+</div>
+<div id="shortsCommentsBackdrop" class="shorts-comments-backdrop" onclick="shortCloseComments()"></div>
+
+<style>
+    .shorts-comments-backdrop {
+        position: fixed; inset: 0; background: rgba(0,0,0,.45);
+        z-index: 59; display: none;
+    }
+    .shorts-comments-backdrop.visible { display: block; }
+    .shorts-comments-pane {
+        position: fixed;
+        right: 0; top: 56px; bottom: 0; width: 420px;
+        background: var(--bg-dark); color: var(--text-primary);
+        box-shadow: -4px 0 24px rgba(0,0,0,.4);
+        z-index: 60; display: none; flex-direction: column;
+        border-left: 1px solid var(--border-color);
+    }
+    .shorts-comments-pane.visible { display: flex; }
+    .shorts-comments-head {
+        display: flex; justify-content: space-between; align-items: center;
+        padding: 12px 16px; border-bottom: 1px solid var(--border-color);
+        font-size: 15px; font-weight: 600;
+    }
+    .shorts-comments-close {
+        background: none; border: none; color: var(--text-primary);
+        cursor: pointer; font-size: 16px; padding: 6px;
+        border-radius: 6px;
+    }
+    .shorts-comments-close:hover { background: rgba(255,255,255,.08); }
+    .shorts-comments-body {
+        flex: 1; overflow-y: auto; padding: 12px 16px;
+    }
+    .shorts-comments-loading {
+        text-align: center; padding: 40px 16px; color: var(--text-secondary);
+    }
+
+    /* Mobile: bottom sheet instead of right drawer. */
+    @media (max-width: 768px) {
+        .shorts-comments-pane {
+            left: 0; right: 0; top: auto; bottom: 56px;
+            width: 100%; height: 70vh;
+            border-left: none; border-top: 1px solid var(--border-color);
+            border-radius: 16px 16px 0 0;
+            box-shadow: 0 -4px 24px rgba(0,0,0,.4);
+        }
+    }
+</style>
+
 @endsection
 
 @section('scripts')