fix(database): column resize uses direct coordinate calculation

Replace delta-based approach with direct mouse-position-to-column-edge calculation:
newW = ev.clientX - thLeft. No setPointerCapture needed, no coordinate drift.

app/templates/_database_table_scripts.html

@@ -165,15 +165,13 @@
             handle.onpointerdown = function(e) {
                 e.preventDefault();
                 e.stopPropagation();
-                this.setPointerCapture(e.pointerId);
                 const propId = parseInt(this.dataset.propId);
                 const th = this.parentElement;
-                const startX = e.clientX;
-                const startW = th.getBoundingClientRect().width;
+                const thLeft = th.getBoundingClientRect().left;
 
                 function onMove(ev) {
-                    const diff = ev.clientX - startX;
-                    const newW = Math.max(60, startW + diff);
+                    // Calculate width directly from mouse position relative to th left edge
+                    const newW = Math.max(60, ev.clientX - thLeft);
                     state.colWidths[propId] = newW;
                     th.style.width = newW + 'px';
                     th.style.minWidth = newW + 'px';
@@ -185,8 +183,7 @@
                         });
                     }
                 }
-                function onUp(ev) {
-                    handle.releasePointerCapture(ev.pointerId);
+                function onUp() {
                     document.removeEventListener('pointermove', onMove);
                     document.removeEventListener('pointerup', onUp);
                     document.body.style.cursor = '';