Enable a few stylelint rules (go-gitea#30038)

No violations but still good to have them.

Author: silverwind

.stylelintrc.yaml

@@ -30,7 +30,7 @@ rules:
   "@stylistic/block-opening-brace-newline-after": null
   "@stylistic/block-opening-brace-newline-before": null
   "@stylistic/block-opening-brace-space-after": null
-  "@stylistic/block-opening-brace-space-before": null
+  "@stylistic/block-opening-brace-space-before": always
   "@stylistic/color-hex-case": lower
   "@stylistic/declaration-bang-space-after": never
   "@stylistic/declaration-bang-space-before": null
@@ -140,7 +140,7 @@ rules:
   function-disallowed-list: null
   function-linear-gradient-no-nonstandard-direction: true
   function-name-case: lower
-  function-no-unknown: null
+  function-no-unknown: true
   function-url-no-scheme-relative: null
   function-url-quotes: always
   function-url-scheme-allowed-list: null
@@ -168,7 +168,7 @@ rules:
   no-duplicate-selectors: true
   no-empty-source: true
   no-invalid-double-slash-comments: true
-  no-invalid-position-at-import-rule: null
+  no-invalid-position-at-import-rule: [true, ignoreAtRules: [tailwind]]
   no-irregular-whitespace: true
   no-unknown-animations: null
   no-unknown-custom-properties: null
@@ -181,6 +181,7 @@ rules:
   rule-empty-line-before: null
   rule-selector-property-disallowed-list: null
   scale-unlimited/declaration-strict-value: [[/color$/, font-weight], {ignoreValues: /^(inherit|transparent|unset|initial|currentcolor|none)$/, ignoreFunctions: false, disableFix: true, expandShorthand: true}]
+  selector-anb-no-unmatchable: true
   selector-attribute-name-disallowed-list: null
   selector-attribute-operator-allowed-list: null
   selector-attribute-operator-disallowed-list: null