[#305] Updated the colour scheme to the new brand palette.

[AlexSkrypnyk]

Closes #305

Checklist before requesting a review

• Subject includes ticket number as [#123] Verb in past tense.
• Ticket number #123 added to description
• Added context in Changed section
• Self-reviewed code and commented in commented complex areas.
• Added tests for fix/feature.
• Relevant tests run and passed locally.

Changed

1. Replaced the palette in config/default/drevops.settings.yml (colors.palette) - all 18 light and dark slots rewritten from the outgoing muted blue and orange scheme to the brand palette anchored on Navy #152235, Deep Navy #030d1e, Cool White #eff6ff, Teal #1e7582, Bright Cyan #96e7f4 and Coral #cd5b43, with intermediate steps taken from the ramps already generated in static-prototype/framework.css.
2. Set use_brand_colors: 0 and updated the colors.brand swatches - hides the Brand colors fieldset in the theme settings form so its JS recompute can no longer overwrite the authored palette; colors.brand itself never reaches rendered CSS.
3. Wrote out all 18 slots explicitly rather than deriving them from the three brand anchors, because CivicTheme's derivation formulas mix with pure black and white and pull the intermediate steps toward grey instead of along the brand's ramps.
4. Mirrored the same 18 slots per theme in web/themes/custom/drevops/components/variables.base.scss, the Storybook fallback used whenever there is no Drupal-generated stylesheet, and removed the leftover starter-kit placeholders success: green, custom1: brown / custom1: red, custom2: orange and custom3: blue.
5. Dropped the $ct-back-to-top-light-background-color override in variables.components.scss, which pointed at the removed custom1 slot - the back-to-top button now falls back to CivicTheme's own interaction-background default.
6. Recoloured the eyebrow kicker in assets/sass/_eyebrow.scss from hardcoded hexes (#c1430a orange, #90cfeb light blue) to the highlight palette slot, Teal on light and Bright Cyan on dark; rich-text table captions pick up the same change automatically through the shared $ct-eyebrow-color and $ct-eyebrow-color-dark variables they already reference.
7. Updated the Storybook spacing demo swatch in 00-base/spacing/spacing.stories.scss from the old brand cyan #61daff to the new Bright Cyan #96e7f4.
8. Added docs/brand-colours.md, indexed from docs/README.md and AGENTS.md - records the palette, the two files that carry it, why every slot is explicit rather than derived, contrast figures, and how to apply a future change.

Screenshots

Verified against /, /contact, /blog, /ai-assisted-delivery, /services, /about-us and /our-work at 1280px and at 390px with the mobile nav open: every text and background pair clears WCAG AA, measured by computing real ratios against the effective composited background, with zero console errors, and keyboard focus rings render the new Coral at 3px on all eight focusable header controls, offset onto the page background.

Before / After

BEFORE - muted blue, orange highlight
┌───────────────────────────────────────────────────┐
│ light   bg #f2f5f8  accent #42748a  focus #ff6b6b │
│ dark    bg #2b3f53  accent #90cfeb  focus #ff6b6b │
└───────────────────────────────────────────────────┘
                          │
                          ▼
AFTER - brand navy, teal, bright cyan, coral
┌───────────────────────────────────────────────────┐
│ light   bg #eff6ff  accent #1e7582  focus #cd5b43 │
│ dark    bg #152235  accent #96e7f4  focus #ff9c86 │
└───────────────────────────────────────────────────┘

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📥 Commits

Reviewing files that changed from the base of the PR and between f9bfa5f and 42c20a8.

📒 Files selected for processing (8)

• AGENTS.md
• config/default/drevops.settings.yml
• docs/README.md
• docs/brand-colours.md
• web/themes/custom/drevops/assets/sass/_eyebrow.scss
• web/themes/custom/drevops/components/00-base/spacing/spacing.stories.scss
• web/themes/custom/drevops/components/variables.base.scss
• web/themes/custom/drevops/components/variables.components.scss

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[github-actions]

Code coverage (threshold: 80%)

  Classes: 48.00% (12/25)
  Methods: 73.42% (58/79)
  Lines:   87.77% (653/744)

Per-class coverage

Drupal\do_ai_alt_text\AltTextGenerator
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Drupal\do_ai_alt_text\Plugin\Action\RegenerateImageAltText
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Drupal\do_base\EventSubscriber\PreviewLinkCacheSubscriber
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Drupal\do_base\EventSubscriber\ThemeColorSubscriber
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Drupal\do_base\Hook\AutomatedListPagerHook
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Drupal\do_base\Hook\MetatagsAlterHook
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Drupal\do_base\Twig\ImageDimensionsExtension
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Drupal\do_content_api\EventSubscriber\JsonApiWriteGateSubscriber
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Drupal\do_content_api\Hook\EntityCreateAccessHook
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Drupal\do_content_api\Hook\ModerationPolicyHook
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Drupal\do_content_api\Routing\RouteSubscriber
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Drupal\do_feed\FeedUrlBuilder
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Drupal\do_feed\Form\FeedSettingsForm
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Drupal\do_feed\Hook\EntityDeleteHook
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Drupal\do_feed\Hook\EntityPresaveHook
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Drupal\do_feed\Hook\PreprocessParagraphHook
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Drupal\do_feed\Hook\PreprocessViewsViewRowRssHook
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Drupal\do_feed\Hook\ViewsPreViewHook
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Drupal\do_generated_content\Generator\CaseMatrix
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Drupal\do_generated_content\Generator\RelativeDate
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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.51%. Comparing base (6382ee8) to head (42c20a8).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #310   +/-   ##
========================================
  Coverage    84.51%   84.51%           
========================================
  Files           26       26           
  Lines          562      562           
========================================
  Hits           475      475           
  Misses          87       87           

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