perf: remove BackdropFilter to reduce GPU overheating#88
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Remove 12 BackdropFilter usages that caused expensive per-frame gaussian blur operations, especially during timeline scrolling where multiple cards were simultaneously computing real-time blur. Replaced with higher-opacity semi-transparent containers that maintain similar visual appearance without the GPU cost. Kept BackdropFilter only in short-lived modal overlays (share_preview_dialog, demo_overlay) where performance impact is negligible. Files changed: - classic_card.dart (4 usages removed) - event_card.dart (1 usage removed) - snapshot_card.dart (1 usage removed) - system_task_card.dart (1 usage removed) - timeline_screen.dart (2 usages removed) - radial_menu.dart (1 usage removed) - agent_activity_widget.dart (1 usage removed) - insight_screen.dart (1 usage removed) - persona_chat_screen.dart (2 usages removed) Also removed unused dart:ui imports where ImageFilter was no longer needed.
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Summary
移除 12 处 BackdropFilter 使用，解决滚动时 GPU 高负载导致的卡顿和发热问题。
Problem
BackdropFilter 在每一帧都执行像素级高斯模糊，是 GPU 密集型操作。在 Timeline 列表中，屏幕上同时可见 3-5 张带模糊的卡片时，GPU 负载成倍增加，导致严重发热和掉帧。
Solution
用更高不透明度的半透明容器替代 BackdropFilter，保持相近的视觉效果，GPU 开销接近零。
改动范围
保留的 BackdropFilter（2处）
share_preview_dialog.dart— 短暂弹窗demo_overlay.dart— 引导覆盖层，只出现一次Visual Impact
Testing
flutter analyze通过，无错误