Fix upvote button: make it reliably clickable from resource cards

[soyalejolopez]

What

Fixes the resource-card upvote button so it actually upvotes instead of navigating to the detail page, and makes reactions/upvotes persist reliably.

Root cause

Card navigation used a full-card "stretched link" overlay (a.resource-link::after { inset: 0; z-index: 1 }) sitting under the upvote button (z-index: 2). The .card-animate fade-in applies a transform, which creates/destroys a stacking context depending on timing. During that window the overlay could intercept the click and navigate to the detail page, so the vote never registered — which looked like the upvote "reverted."

Fix

• Removed the fragile stretched-link overlay CSS.
• Replaced it with explicit, control-aware whole-card navigation in JS that ignores .vote-btn clicks and resolves the resource link from the clicked card.

Verification

Verified in a real browser (Playwright) across:

• Comfortable + compact/list views
• Mid-animation clicks (no accidental navigation)
• Upvote persistence across page reloads (localStorage key ft-votes)
• Whole-card body click still opens the detail page
• Title link still opens the detail page

Single-file change: index.html.