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/scripts/ui/menu/menu.css

@@ -17,7 +17,7 @@
 }
 
 .comfyui-button:active {
-  box-shadow: inset 1px 1px 10px rgba(0, 0, 0, 0.5);
+  box-shadow: inset 1px 1px 10px rgb(0 0 0 / 0.5);
 }
 
 .comfyui-button:disabled {
@@ -39,13 +39,13 @@
 /* Popup */
 .comfyui-popup {
   position: absolute;
-  left: var(--left);
-  right: var(--right);
   top: var(--top);
+  right: var(--right);
   bottom: var(--bottom);
+  left: var(--left);
   z-index: 2000;
   max-height: calc(100vh - var(--limit) - 10px);
-  box-shadow: 3px 3px 5px 0 rgba(0, 0, 0, 0.3);
+  box-shadow: 3px 3px 5px 0 rgb(0 0 0 / 0.3);
 }
 
 .comfyui-popup:not(.open) {