Please add tooltips to icons.

Please add tooltips to icons. There is a right-facing triangle button in the upper-right of my workspace. What does it do? A simple tooltip would tell me.

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| Field | Value |
| --- | --- |
| App version | 1.1.2 |
| OS | Windows 10.0.26100 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 9 |

Start by inspecting the desktop app's /chat view and locate the right-facing triangle button in the workspace's upper-right area. Identify the related icon controls and verify that their tooltips clearly explain their actions; done when the reported button and the relevant icons expose helpful tooltips.

索引モデルが issue の本文から書いたものです。