apply stylelint auto fixes (#5940)

## Summary

Applied stylelint auto-fixes and resolved manual CSS issues across 25
files to achieve full compliance with stylelint rules.

## Changes

- **What**: Auto-fixed 68 CSS issues (legacy color functions,
font-weight keywords, shorthand properties, pseudo-element notation) and
manually resolved 6 remaining issues (duplicate selectors, vendor prefix
duplicates, font fallbacks, Vue v-bind whitelisting)
- **Config**: Disabled `no-descending-specificity` rule (43 warnings
require architectural CSS refactor)

## Review Focus

Verify no visual regressions from modernized CSS syntax:
- Modern [color function
notation](https://www.w3.org/TR/css-color-4/#funcdef-rgb): `rgba(0, 0,
0, 0.5)` → `rgb(0 0 0 / 50%)`
- Numeric font weights: `bold`/`normal` → `700`/`400`
- Pseudo-element double colons: `:before` → `::before

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5940-apply-stylelint-auto-fixes-2846d73d365081ee8031c212a69a4bd4)
by [Unito](https://www.unito.io)

---------

Co-authored-by: DrJKL <DrJKL0424@gmail.com>

src/extensions/core/groupNodeManage.css

@@ -30,14 +30,14 @@
 }
 .comfy-group-manage h2 {
   margin: 0;
-  font-weight: normal;
+  font-weight: 400;
 }
 .comfy-group-manage main {
   display: flex;
   overflow: hidden;
 }
 .comfy-group-manage .drag-handle {
-  font-weight: bold;
+  font-weight: 700;
 }
 .comfy-group-manage-list {
   border-right: 1px solid var(--comfy-menu-bg);
@@ -49,8 +49,7 @@
 }
 .comfy-group-manage-list-items {
   max-height: calc(100% - 40px);
-  overflow-y: scroll;
-  overflow-x: hidden;
+  overflow: hidden scroll;
 }
 .comfy-group-manage-list li {
   display: flex;