fix: image resize preview, todo checkbox alignment, modal overflow clip

- Image resize respects width attr in preview (no more snap-back)
- Single-task checkbox aligned with flex center instead of translateY hack
- Modal/detail containers clip card-bar at rounded corners
- Right-click on image no longer triggers resize (left-button only)
- Split dist.sh and bump.sh into separate scripts

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/js/modules/editor.js

@@ -1292,6 +1292,7 @@ $('md-asset-picker')?.addEventListener('click', async () => {
 // ── Image resize ──
 
 document.addEventListener('mousedown', e => {
+    if (e.button !== 0) return;
     const img = e.target.closest('.prose img');
     if (!img || img.closest('.md-gallery-item')) return;
     e.preventDefault();