fix(desktop): make right-sidebar refresh button always visible instead of hover-reveal

[XueQi-2957]

Bug Description

The refresh button in the file explorer's top bar (right-sidebar) was only visible when hovering over the folder-name label. As the user moved their mouse from the label toward the button, they left the label area — causing the button to disappear before they could click it, making the refresh button effectively unusable.

Root Cause

The refresh button used HEADER_ACTION_LABEL_REVEAL CSS classes:

pointer-events-none opacity-0 transition-opacity
peer-hover/project-label:pointer-events-auto peer-hover/project-label:opacity-100

This made the button invisible (opacity-0) and non-interactive (pointer-events-none) by default. It only became visible when the adjacent folder-name label (.peer/project-label) was hovered — but moving the cursor toward the button left the label, removing the peer-hover state and hiding the button again.

Fix

1. Change the refresh button's className from HEADER_ACTION_LABEL_REVEAL to HEADER_ACTION_CLASS — the same always-visible class used by the open-folder and collapse-all buttons.
2. Remove the now-unused HEADER_ACTION_LABEL_REVEAL constant and update the comment.

How to Verify

1. Open Hermes Desktop with a project folder selected.
2. Look at the right-sidebar's top bar — the refresh button (⟳) should always be visible next to the folder name.
3. Move your mouse directly onto the refresh button and click it — it should refresh the file tree without disappearing.

Risk Assessment

Low — only a CSS class change on one button. The other two toolbar buttons (open-folder, collapse-all) already use HEADER_ACTION_CLASS with no issues. The worst case is the button remains visible when it shouldn't be, which is the desired behavior.

[tonydwb]

Code Review Summary

Verdict: Approved

UX improvement: the sidebar refresh button is now always visible instead of requiring hover on desktop. Small but meaningful usability fix for the right panel.

Looks Good

• Single CSS/styling change (hover-reveal → always-visible)
• No security concerns, no test changes needed

[XueQi-2957]

fine

[teknium1]

Thanks for the focused desktop usability report and patch.

Automated hermes-sweeper review found that current main already implements the reported reachability guarantee:

• fix(desktop): keep file tree refresh clickable #46244 merged as 9d2ec8d35a2aa815f036a8d5bfa4698278210b16 and changed the refresh reveal from project-label hover to whole-header hover.
• apps/desktop/src/app/right-sidebar/index.tsx:119 now uses group-hover/project-header and group-focus-within/project-header; the refresh button at :156 uses that class, and the enclosing header is the group/project-header at :197.
• This shipped in v2026.6.19; the related [Bug] Hermes Desktop: right-sidebar file-tree refresh button disappears when cursor moves onto it #45894 discussion also confirms this header-hover implementation fixes the cursor-transition failure.

Closing as implemented on main.