feat: tailwind-poc

[Zaimwa9]

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[!NOTE] Add Tailwind CSS and Autoprefixer via PostCSS, wire into webpack, and apply initial Tailwind-based style/class updates.

• Build/Config
  • Add tailwindcss, autoprefixer, and eslint-plugin-tailwindcss; create postcss.config.js.
  • Introduce tailwind.config.js with custom theme (colors, fonts, radii, spacing, dark mode via class, preflight disabled).
  • Update webpack to use postcss-loader for css/scss in local, prod, and Django builds.
  • Import Tailwind styles via web/styles/tailwind.css and reference in web/main.js and styles.scss.
• Styling
  • Add Tailwind directives and CSS variables; new .tabs base styles.
  • Large portions of legacy input styles in components/_input.scss commented out.
• UI Tweaks
  • Minor class adjustments to use utility classes (e.g., d-flex→flex, add btn btn-secondary, dark:text-red-500).
  • Small content/class tweaks in FeatureAnalytics.container.tsx, Tabs.tsx, OrganisationNavbar.tsx, UsersAndPermissionsPage.tsx.

^{Written by Cursor Bugbot for commit 680d781287d6e5572bbb1ef4f7be992b1fffc3ae. This will update automatically on new commits. Configure here.}

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Project	Deployment	Preview	Comments	Updated (UTC)
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ghcr.io/flagsmith/flagsmith-frontend:pr-6105	Finished :white_check_mark:	Results :white_check_mark:

[talissoncosta]

@Zaimwa9 Should we consider adding a prefix on tailwind classes in order to avoid conflicts ? like tw-*, then we can remove it after the full migration. (just an idea...)