Unable to resize window to desired width

**Device model, version and app version**

Model Name: Mac Mini 2024 (Apple M4 Pro)
macOS Version: 26.6.1
App Version: 2026.7.3 (2026.2546)
Safari Version: 26.6 (21624.4.5.11.5)

**Home Assistant Core Version**

2026.8.1

**Describe the bug**
After upgrading, I can no longer decrease the window to the desired width (300 px).

**To Reproduce**
Resize window, stops around 500 px wide.

**Expected behavior**
Continues resizing down to 300 px.

**Screenshots**

**Additional context**

Start by reproducing the resize behavior on the listed Mac mini, macOS, app, Safari, and Home Assistant Core versions, then locate the macOS window sizing entry point. Confirm the fix by verifying that the window can be reduced to the expected 300 px width without affecting Safari behavior.

Written by the indexing model from the issue text.