Merge branch 'fix/collection-remove-touch' into chore/reconcile-ui-review

frontend/src/routes/collections/[id]/+page.svelte

@@ -406,6 +406,19 @@
         opacity: 1;
     }
 
+    /* Touch has no hover, so the reveal-on-hover treatment leaves the
+       remove buttons invisible and undiscoverable. Show them persistently
+       and enlarge the hit area on phones. (Capped well below 44px because
+       the button floats over a 4-up cover thumbnail — a full touch-floor
+       square would swallow the cover.) */
+    @media (max-width: 640px) {
+        .remove {
+            opacity: 1;
+            width: 32px;
+            height: 32px;
+        }
+    }
+
     .icon-btn {
         display: inline-flex;
         align-items: center;

frontend/src/routes/collections/[id]/remove-touch.test.ts

@@ -0,0 +1,49 @@
+import { describe, it, expect } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+// The per-card "remove" buttons on a collection are revealed on hover /
+// focus-within (opacity 0 → 1), which leaves them invisible and
+// undiscoverable on touch. They must be shown persistently at the mobile
+// breakpoint. jsdom can't evaluate @media or layout, so this pins the CSS
+// contract: the 640px block makes `.remove` opaque. (Same approach as the
+// shared touch-target contract test.)
+
+const SRC = readFileSync(
+    resolve(process.cwd(), 'src/routes/collections/[id]/+page.svelte'),
+    'utf8'
+);
+
+// Brace-balanced extraction of every `@media (max-width: 640px) { ... }` body.
+function mobileBlocks(css: string): string {
+    const marker = '@media (max-width: 640px)';
+    let out = '';
+    let from = 0;
+    for (;;) {
+        const start = css.indexOf(marker, from);
+        if (start === -1) break;
+        const open = css.indexOf('{', start);
+        if (open === -1) break;
+        let depth = 0;
+        let i = open;
+        for (; i < css.length; i++) {
+            if (css[i] === '{') depth++;
+            else if (css[i] === '}') {
+                depth--;
+                if (depth === 0) break;
+            }
+        }
+        out += css.slice(open + 1, i) + '\n';
+        from = i + 1;
+    }
+    return out;
+}
+
+const squish = (s: string) => s.replace(/\s+/g, ' ');
+
+describe('collection remove buttons on touch', () => {
+    it('reveals the remove buttons persistently at the mobile breakpoint', () => {
+        const mobile = squish(mobileBlocks(SRC));
+        expect(mobile).toMatch(/\.remove[^}]*opacity:\s*1/);
+    });
+});