jaredandClaude Sonnet 5
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The attachment grid's <img> thumbnail pointed at the same download_attachment.php URL as the full-size original, so previewing a multi-MB photo attachment cost a full multi-MB download just to render a small grid preview. loading="lazy" only deferred off-screen images; it never reduced per-image transfer size. Generate a resized JPEG thumbnail (longest side capped at 300px) via GD at upload time, from the same metadata-stripped image stripImageMetadata() already produces, reusing its decompression-bomb guard (~40MP decode cap). Store the thumbnail's filename in a new nullable ticket_attachments. thumbnail_filename column (migration 005); NULL means no thumbnail exists (non-image, GD unavailable, or an attachment predating this change) and callers fall back to the full-size original. download_attachment.php serves the thumbnail when requested via ?thumb=1 and one exists, falling back to the original otherwise. The attachments grid now requests thumb=1 for its <img> preview; the lightbox link is unchanged and still opens the full-size original. delete_attachment.php removes the thumbnail file alongside the original, and cleanup_orphan_uploads.php's orphan lookup now also matches thumbnail_filename so generated thumbnails aren't swept up as orphans. Verified against real MariaDB + GD: a 1600x1200 test JPEG produced a 300x225 thumbnail at ~1.8KB vs. the 52KB original (~29x smaller); confirmed the serving logic picks the thumbnail for image attachments with one, falls back to the original for a non-image attachment even when thumb=1 is requested, and that the updated orphan-cleanup lookup matches both the original and thumbnail filename (and correctly finds neither for an unrelated filename). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0117oBw2jN4kALYeS8HPq4zV