fix: 辅助视觉模型编辑器卡死 + 模型下拉框显示 (#1529, #1416)

[Andy365-365]

#1529: 编辑视觉模型时界面卡死
原因：.auxiliary-panel 样式中的 overflow: hidden 创建了层叠上下文边界，
裁剪了 NModal 内 NSelect 下拉菜单的渲染区域，导致下拉菜单无法打开、取消按钮
无响应。修复：移除 overflow: hidden。

#1416: 主页面模型下拉框显示为空
原因：selectedDisplayName 在模型不在当前 profile 模型组中时返回空字符串。
修复：回退到 displayModelName 显示原始模型名；同时修复 computed 内
的 side effect 反模式，改用 watch()。

Closes #1529
Closes #1416

[suzunn]

I noticed one cross-profile edge case worth locking down before merge. listJobs(true) now returns jobs from every profile and annotates them with _profile, but the rest of the job actions still look like they operate through the active profile context. That can make an agent-profile job visible in the main task panel while edit, toggle, or delete later targets the wrong profile or fails once the active profile differs from job._profile.

I would either route the job action APIs with the job's _profile when present, or make non-active-profile cards explicitly read-only until those mutations are profile-aware. A regression test that lists jobs from two profiles and then toggles/deletes the non-active-profile job would cover the failure mode well.

[Andy365-365]

Thanks for the review @suzunn! After discussion with the repo maintainers, we decided that cross-profile job listing isn't needed — EKKOLearnAI clarified that different profiles should be viewed by switching profiles, not aggregated in one view. We've removed the entire cross-profile job listing feature from this PR. It now only fixes the vision model editor freeze (#1529) and the model dropdown display issue (#1416).