Apply server foreground colour to object counts (#9766) (#10041)

Apply muted server foreground colour to column type labels (#9766)

Issue #9766 asked for both the object counts and the column type text
to follow the server's custom foreground colour. The dynamic per-server
CSS rule only recoloured the file-name and children-count spans, leaving
the column type text (span.text-muted) at its default low-contrast
colour.

Recolour span.text-muted to a reduced-emphasis blend of the foreground
colour using color-mix, so the datatype still reads as de-emphasised
secondary text while following the server colour.

Author: dpage

docs/en_US/release_notes_9_16.rst

@@ -48,6 +48,7 @@ Bug fixes
   | `Issue #9595 <https://github.com/pgadmin-org/pgadmin4/issues/9595>`_ -  Fix missing ALTER ... SET DEFAULT statements for inherited columns in the generated table SQL/EDIT script.
   | `Issue #9677 <https://github.com/pgadmin-org/pgadmin4/issues/9677>`_ -  Fix the Unlogged table toggle in table properties not generating any ALTER TABLE ... SET LOGGED/UNLOGGED statement.
   | `Issue #9762 <https://github.com/pgadmin-org/pgadmin4/issues/9762>`_ -  Fix the "Cannot read properties of undefined (reading 'map')" crash in the desktop runtime when a menu refresh is triggered before the application menus have been received.
+  | `Issue #9766 <https://github.com/pgadmin-org/pgadmin4/issues/9766>`_ -  Fixed an issue where a server's custom foreground colour was not applied to the object counts (children count) and column type labels shown in the object explorer.
   | `Issue #9828 <https://github.com/pgadmin-org/pgadmin4/issues/9828>`_ -  Fix tool calls failing against OpenAI-compatible providers that emit empty/null name, arguments, or id fields in streaming continuation deltas.
   | `Issue #9854 <https://github.com/pgadmin-org/pgadmin4/issues/9854>`_ -  Fix the JSON editor stripping trailing fractional zeros (e.g. 10.00) and rewriting large integers in jsonb values, which corrupted unmodified numbers when saving.
   | `Issue #9868 <https://github.com/pgadmin-org/pgadmin4/issues/9868>`_ -  Warn before opening a very large JSON/JSONB value in the data grid cell editor, which could freeze pgAdmin, and let the user choose whether to proceed.

web/pgadmin/browser/static/js/node.js

@@ -741,9 +741,13 @@ define('pgadmin.browser.node', [
                 background: ${bgcolor} !important;
               }
               ${fgcolor ? `
-              .${dynamic_class} span.file-name, .${dynamic_class} span.file-name:hover, .${dynamic_class} span.file-name.pseudo-active {
+              .${dynamic_class} span.file-name, .${dynamic_class} span.file-name:hover, .${dynamic_class} span.file-name.pseudo-active,
+              .${dynamic_class} span.children-count {
                 color: ${fgcolor} !important;
               }
+              .${dynamic_class} span.text-muted {
+                color: color-mix(in srgb, ${fgcolor} 65%, transparent) !important;
+              }
               `:''}
             `;