feat(layout): stick the title row too, and chain the sticky offsets

"All items · N items" scrolled away like the pager did. It now sticks at
the scrollport top (padding-top/negative margin cancel .content's padding
so nothing shows through the gap), and the three things below it offset
by --hdr-h: batch bar, pagination, and the table header (--hdr-h + --pag-h).
Both vars are measured on .content in renderEntries.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

css/style.css

@@ -800,7 +800,15 @@ input[type="range"]::-webkit-slider-thumb {
 .dropdown-item svg { color: var(--text-dim); }
 
 .content { flex: 1; padding: 24px 32px; overflow-y: auto; }
-.content-header { display: flex; align-items: baseline; gap: 12px; margin-bottom: 20px; }
+/* Sticky title row. The negative top margin cancels .content's padding-top so
+   nothing scrolls through the gap above it. Everything else that sticks
+   (batch bar, pagination, table header) offsets by --hdr-h. */
+.content-header {
+    display: flex; align-items: baseline; gap: 12px; margin-bottom: 20px;
+    position: sticky; top: 0; z-index: 12;
+    background: var(--bg);
+    padding-top: 24px; margin-top: -24px;
+}
 .content-header h2 { font-size: 22px; font-weight: 600; margin: 0; }
 .content-meta { color: var(--text-faint); font-size: 12px; }
 
@@ -1000,7 +1008,7 @@ input[type="range"]::-webkit-slider-thumb {
 /* Batch action bar (appears when selection is non-empty) */
 .batch-bar {
     position: sticky;
-    top: -1px;
+    top: var(--hdr-h, 0px);
     z-index: 10;
     display: flex; align-items: center; gap: 8px;
     padding: 10px 14px;
@@ -2581,6 +2589,7 @@ body[data-editor-position="center"]:has(#settingsPanel.is-open)::before {
     .nav-item { justify-content: center; padding: 8px; }
     .topbar { padding: 12px 16px; }
     .content { padding: 16px; }
+    .content-header { padding-top: 16px; margin-top: -16px; }
     .slideover { width: 100%; }
     /* On a narrow viewport the slideover fills the screen — no point
        pushing the shell, the table isn't visible anyway. */
@@ -2676,7 +2685,7 @@ body[data-editor-position="center"]:has(#settingsPanel.is-open)::before {
     border-bottom: 1px solid var(--border);
     background: var(--bg-elev);
     user-select: none;
-    position: sticky; top: var(--pag-h, 0px);
+    position: sticky; top: calc(var(--hdr-h, 0px) + var(--pag-h, 0px));
     z-index: 1;
 }
 .entry-table th.is-sortable { cursor: pointer; }
@@ -2968,7 +2977,7 @@ input[type="password"]::-ms-clear {
    is pushed down by --pag-h (measured in renderEntries). */
 .pagination {
     position: sticky;
-    top: 0;
+    top: var(--hdr-h, 0px);
     z-index: 2;
     background: var(--bg);
     display: flex; align-items: center; gap: 6px;

js/app.js

@@ -2296,13 +2296,16 @@ function renderGrid() {
     const start = (state.currentPage - 1) * state.pageSize;
     const pageList = list.slice(start, start + state.pageSize);
 
+    // Sticky offsets: the pagination bar parks under the title row, and the
+    // table header under both. Measured, so a wrapped pager still lines up.
+    const content = $('.content');
+    content.style.setProperty('--hdr-h', $('.content-header').offsetHeight + 'px');
     if (total > 10) {
         const pag = renderPagination(total, totalPages);
         grid.appendChild(pag);
-        // The table header sticks below the sticky pagination bar, not under it.
+        content.style.setProperty('--pag-h', pag.offsetHeight + 'px');
-        grid.style.setProperty('--pag-h', pag.offsetHeight + 'px');
     } else {
-        grid.style.setProperty('--pag-h', '0px');
+        content.style.setProperty('--pag-h', '0px');
     }
 
     if (state.viewMode === 'table') {