Replace PrimeNG with Tailwind and our own components

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Dal 8/11/2026.

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Descrizione

by: ai dev work frontend
What

PrimeNG 22 needs a commercial license, and PrimeNG 21 doesn't support Angular 22, so it blocks this epic. #864 settled on replacing it (decision: https://github.com/Northeastern-Electric-Racing/Argos/issues/864#issuecomment-6710745579).

This ticket lands spike #955 on develop:

  • Every route and dialog runs on our own components.
  • Angular Aria and the CDK handle behaviour.
  • Tailwind utilities on a locked set of tokens handle styling.
  • PrimeNG and Angular Material are removed.
Requirements
  • No PrimeNG or Angular Material package, and no stylesheets on rendered components (the unused components are deleted in #962)
  • All 14 routes and their dialogs keep the PrimeNG look. The four open look changes are decided: log row hover, BMS panel titles, charging nub and SoC card height.
  • A WCAG AA audit passes on every route at 390 and 1440 wide: contrast, focus, reflow and target size
  • Total CSS stays at or under 121.8 kB, with no budget raised
  • An ADR and the conventions in docs/CONTEXT.md describe the approach
Notes
  • Where to build: start from the branch 955-try-tailwind-angular-aria-cdk, from spike PR #958 (now closed). It also contains #814's upgrade (PR #879) and #909's Aria/CDK work, so it lands after #814.
  • Dropped approaches:
    • Material (#866): its look and checkbox tree didn't fit.
    • Spartan (#867): no reason was recorded.
    • Taiga (#868): Russian-backed.
    • ng-zorro (#869): no reason was recorded.
    • Fork of PrimeNG 21 (#871): we'd own every future Angular fix.
    • Aria/CDK without Tailwind (#909): carried forward, with Tailwind added on top.
  • Not checked offline: the Mapbox map, which needs a token, and the main landmark on Safari before 17.
  • Open question: should the Playwright audit kit run in CI?
Context transfer
SUMMARY
Spike #955 (PR #958) already migrated every route; this ticket reviews, finishes and lands it after #814.

CONTEXT
- Tokens: src/styles/theme.css (--color-*: initial; AA-vetted only). Recipes: src/ui/recipes/. Primitives: src/ui/.
- Cascade layers: theme, base, vendor, cdk, components, utilities. Mapbox CSS is a non-injected bundle in the vendor layer, linked by the map page. Only the CDK's runtime overlay CSS is unlayered.
- Icons: <ui-icon> (Material Icons font ligatures and registered SVGs); @angular/material uninstalled.
- At 64425612: 547 tests pass; prettier, lint and build pass. Global CSS is 81.7 kB raw / 12.9 kB transfer; Mapbox's CSS (36.4 kB) loads only on /map.
- Traps: classes can't be built from strings; words in comments emit utilities; Angular's Vitest uses isolate:false, so restore window stubs in afterEach.

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