fix(web): code review round 1 remaining UI fixes

- EmojiPanel: add missing 手势/物品 categories, 12-column grid per README §3.3
- DetailColumn: add 投诉举报 row, real ID/region/签名 via new getUserProfile
  API, chevron_right icons now use --color-icon-arrow token (were tertiary
  text color), regroup rows so dividers only sit between sections not every
  row (matches design-code reference exactly)
- MessageBubble/ConversationView: right-clicked message bubble now gets the
  spec's outline while its context menu is open
- ChatListColumn/AppShell: pinned 系统消息/文件助手 rows using confirmed
  bootstrap entries/entry_badges topic names ("sys"/"slf"); route to the
  existing SectionPlaceholder pattern since their own dedicated layouts are
  Phase 8, not built yet

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/features/messages/ConversationView.tsx

@@ -307,6 +307,7 @@ export function ConversationView() {
             myUserId={myUserId}
             selectMode={selectMode}
             selected={typeof msg.seq === 'number' && selectedSeqs.has(msg.seq)}
+            menuActive={typeof msg.seq === 'number' && menu?.msg.seq === msg.seq}
             onToggleSelect={toggleSelect}
             onContextMenu={(e, m) => setMenu({ x: e.clientX, y: e.clientY, msg: m })}
           />