fix(themes): add --syn-global to the Harbor Night scheme and the token reference (#1400)

#1393 added the --syn-global token to tokens.css but not to the Harbor Night scheme (the theme template) or the generated token reference in docs/plugins/themes.md, so the theme tests failed. The scheme gives it the --syn-variable colour, as tokens.css does.

docs/plugins/themes.md

@@ -318,7 +318,7 @@ a token.
 
 <!-- BEGIN GENERATED TOKEN REFERENCE: pnpm gen:theme-docs -->
 
-223 themeable tokens: 117 in the UI theme file, 106 in the editor colour scheme file.
+224 themeable tokens: 117 in the UI theme file, 107 in the editor colour scheme file.
 
 ### Surfaces (UI theme)
 
@@ -420,6 +420,7 @@ a token.
 | `--syn-number` | `#2aacb8` | `#1750eb` |
 | `--syn-punct` | `#bcbec4` | `#080808` |
 | `--syn-variable` | `#bcbec4` | `#080808` |
+| `--syn-global` | `var(--syn-variable)` | `var(--syn-variable)` |
 | `--syn-param` | `#bcbec4` | `#080808` |
 | `--syn-property` | `#c77dbb` | `#871094` |
 | `--syn-constant` | `#c77dbb` | `#871094` |

plugins/official/harbor-night/themes/harbor-night.scheme.json

@@ -18,6 +18,7 @@
     "--syn-number": "#7fc8f8",
     "--syn-punct": "#a9b4c2",
     "--syn-variable": "#d9dfe8",
+    "--syn-global": "#d9dfe8",
     "--syn-param": "#d9dfe8",
     "--syn-property": "#b9a3f0",
     "--syn-constant": "#e58fa3",