feat: improve responsive navbar UX and align full stack quality updates (waiting for approval)

[bhaktofmahakal]

This PR delivers meaningful frontend and backend quality improvements, with the most visible impact on navigation usability.

what's improved

• Enhanced frontend UX with a more reliable responsive navbar experience.
• Added/improved mobile navigation behavior (including burger menu flow and accessibility labels).
• Improved desktop navigation usability with better structure/scroll handling.
• Included supporting test and code-quality updates to keep behavior stable.

Why this is useful

• Better navigation clarity on both mobile and desktop.
• Improved usability and production-readiness for real users.
• Cleaner contributor/reviewer experience through scoped, test-backed changes.

Screenshots for review

• https://github.com/user-attachments/assets/c79010e8-86d2-49c8-836f-d77c73cef98f
• https://github.com/user-attachments/assets/f24d7b31-8cc3-4ac3-80d3-5e5bab5a79d9
• https://github.com/user-attachments/assets/40d4e425-a1e6-49ba-8e9c-8c4d9c1b03d0
• https://github.com/user-attachments/assets/bd11044a-1b90-4c67-a07d-7148b68effc5

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Pull request overview

This PR focuses on improving frontend navigation and UI polish (responsive navbar, updated iconography, interactive card treatment) while adding/adjusting unit tests to keep the updated behavior stable.

Changes:

• Refactors the Navbar for improved responsive behavior (scrollable desktop nav, mobile burger menu, accessibility labels) and updates Footer styling.
• Introduces a reusable SpotlightCard component and applies it to cards on the homepage and politician list.
• Adds/updates Jest tests to cover the new UI components and key homepage/navbar/footer behaviors.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
readme.md	Minor markdown cleanup.
frontend/lib/api/user.ts	Updates API base URL handling and removes debug logging.
frontend/components/ui/SpotlightCard.tsx	Adds new interactive spotlight/hover card component.
frontend/components/ui/Button.tsx	Updates internal link rendering (removes legacyBehavior/anchor wrapper) and fixes prop forwarding.
frontend/components/layout/Navbar.tsx	Responsive navbar refactor with desktop scroll nav + mobile menu and better a11y labeling.
frontend/components/layout/Footer.tsx	Footer styling refresh and swaps inline SVG for lucide icon.
frontend/components/PreambleSection.tsx	Rounds SVG spoke coordinates to fixed precision.
frontend/components/PoliticianCard.tsx	Replaces motion.div hover wrapper with SpotlightCard.
frontend/app/page.tsx	Replaces emoji icons with lucide icons, applies SpotlightCard, and tweaks motion initial behavior.
frontend/tests/components/SpotlightCard.test.tsx	Adds unit tests for SpotlightCard rendering + CSS variable updates.
frontend/tests/components/PreambleSection.test.tsx	Adds test ensuring fixed-precision spoke coordinates.
frontend/tests/components/Navbar.test.tsx	Adds tests for desktop nav rendering, dashboard links, and mobile menu toggle.
frontend/tests/components/Footer.test.tsx	Adds test for footer content and GitHub link.
frontend/tests/components/Button.test.tsx	Adds test ensuring icon props aren’t forwarded to DOM for link buttons.
frontend/tests/app/homepage-sections.test.tsx	Adds tests ensuring key sections render and emojis are removed from feature cards.

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[bhaktofmahakal]

Waiting for Approval from maintainer(SKS).

[imsks]

@bhaktofmahakal Fix the conflicts