`title-block.scss` has bad layer delimiters

[cscheid]

The hungry ghost spotted this problem while I was working on the Rust port:

⏺ The title block styles are now included in the compiled CSS.

  Now let me explain the TS Quarto bug I found regarding the layer boundary parsing:

  TS Quarto Layer Parsing Bug

  I discovered that the title-block.scss file uses layer boundary markers that don't match TS Quarto's own regex:

  The File Content (title-block.scss)

  /*-- scss: functions --*/    ← Line 1: space AFTER colon
  @function bannerColor() { ... }

  /*-- scss:variables --*/     ← Line 32: "variables" not a valid name
  $title-banner-color: null !default;

  /*-- scss:rules --*/         ← Line 37: VALID marker
  .quarto-title-banner { ... }

  TS Quarto's Regex

  "^\/\\*\\-\\-[ \\t]*scss:(uses|functions|rules|defaults|mixins)[ \\t]*\\-\\-\\*\\/$"

  This regex has two requirements that title-block.scss violates:

  1. No space after colon: The regex is scss:(...) with no whitespace between : and the layer name. But line 1 has scss: functions (with a space).
  2. Only 5 valid layer names: uses|functions|rules|defaults|mixins. But line 32 uses variables, which isn't in this list.

  The Result

  In TS Quarto, when parsing title-block.scss:
  - Line 1 (/*-- scss: functions --*/) does NOT match
  - Line 32 (/*-- scss:variables --*/) does NOT match
  - Line 37 (/*-- scss:rules --*/) DOES match

  So all content before line 37 (the functions AND variables) gets dumped into the defaults section (the initial accumulator). Only the /*-- scss:rules --*/
  marker is recognized.

  Why It "Works"

  The SCSS still compiles because:
  - Functions in defaults aren't ideal but work (SCSS is permissive about order within the assembled string)
  - Variables in defaults is actually where they should be (!default variables)
  - Rules get correctly separated

  But this means the layer separation is not working as intended - the functions should be in the functions section so they appear before the defaults in the
  final assembled SCSS.