Integrate lt.time.ago() for dashboard timestamps, update README

- Add data-ts attributes to table and card view date cells so JS can
  convert them to relative time ("2h ago") while keeping the full date
  in the title attribute for hover tooltips
- Add initRelativeTimes() in dashboard.js using lt.time.ago(); runs on
  DOMContentLoaded and refreshes every 60s so times stay current
- Fix table sort for date columns to read data-ts attribute instead of
  text content (which is now relative and not sortable as a date)
- Update README: add base.css/base.js/utils.js to project structure,
  fix ascii-banner.js description, expand keyboard shortcuts table,
  add developer notes for lt.time and boot sequence behavior

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/js/dashboard.js

@@ -366,11 +366,13 @@ function sortTable(table, column) {
         const aValue = a.children[column].textContent.trim();
         const bValue = b.children[column].textContent.trim();
 
-        // Check if this is a date column
+        // Check if this is a date column — prefer data-ts attribute over text (which may be relative)
         const headerText = headers[column].textContent.toLowerCase();
         if (headerText === 'created' || headerText === 'updated') {
-            const dateA = new Date(aValue);
-            const dateB = new Date(bValue);
+            const cellA = a.children[column];
+            const cellB = b.children[column];
+            const dateA = new Date(cellA.dataset.ts || aValue);
+            const dateB = new Date(cellB.dataset.ts || bValue);
             return currentDirection === 'asc' ? dateA - dateB : dateB - dateA;
         }
 
@@ -1817,6 +1819,24 @@ function hideLoadingOverlay(element) {
     }
 }
 
+// ========================================
+// RELATIVE TIMESTAMPS
+// ========================================
+
+/**
+ * Convert all .ts-cell[data-ts] elements to relative time using lt.time.ago().
+ * Runs once on DOMContentLoaded and refreshes every 60s so "2m ago" stays current.
+ * The original full timestamp is preserved in the title attribute for hover.
+ */
+function initRelativeTimes() {
+    document.querySelectorAll('.ts-cell[data-ts]').forEach(el => {
+        el.textContent = lt.time.ago(el.dataset.ts);
+    });
+}
+
+document.addEventListener('DOMContentLoaded', initRelativeTimes);
+setInterval(initRelativeTimes, 60000);
+
 // Export for use in other scripts
 window.generateSkeletonRows = generateSkeletonRows;
 window.generateSkeletonComments = generateSkeletonComments;