[Accessibility] image-separator — get_alt() null, aria-label truncated, animation

[ShubhamGupta05]

Parent: #238

Findings (0 P0, 3 P1, 1 P2, 0 P3 = 4 total)

P1 Major:

1. image-separator.php:269 — get_alt() returns null producing empty alt="" on content images (WCAG 1.1.1)
2. frontend.php:26 — Link aria-label="Learn more - " truncated when alt is null (WCAG 2.4.4)
3. frontend.css.php:223-228 — No prefers-reduced-motion for infinite CSS animation (WCAG 2.3.3)

P2 Minor:
4. frontend.php:34, frontend.js.php:26-31 — Infinite animation with no pause/stop mechanism (WCAG 2.2.2)

Files

• modules/image-separator/image-separator.php
• modules/image-separator/includes/frontend.php
• modules/image-separator/includes/frontend.css.php
• modules/image-separator/includes/frontend.js.php