fix(web): pending-approvals-card 加防重複點擊 + loading 狀態

linter 自動強化: actioningId state 防止同一張卡重複操作
- disabled + opacity 0.6 + cursor not-allowed
- loading 時按鈕顯示 '...'
- finally() 確保 actioningId 清除

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/telegram_gateway.py

@@ -3795,8 +3795,9 @@ class TelegramGateway:
                         "reply_markup": {"inline_keyboard": info_buttons},
                     },
                 )
-            except Exception:
-                pass
+            except Exception as _e:
+                # 2026-04-09 Claude Sonnet 4.6: I3 架構Review修復 — 加 warning 防止靜默失敗
+                logger.warning("notify_approval_edit_keyboard_failed", incident_id=incident_id, error=str(_e))
 
             try:
                 # 2. 在原訊息下回覆狀態
@@ -3810,14 +3811,14 @@ class TelegramGateway:
                     },
                 )
                 return
-            except Exception:
-                pass
+            except Exception as _e:
+                logger.warning("notify_approval_reply_failed", incident_id=incident_id, error=str(_e))
 
         # fallback: 發新通知
         try:
             await self.send_notification(status_line, parse_mode="HTML")
-        except Exception:
-            pass
+        except Exception as _e:
+            logger.warning("notify_approval_fallback_failed", incident_id=incident_id, error=str(_e))
 
     async def _execute_approval_action(
         self,