Records page: sortable headers and short date formatting

- Click any column header to sort asc/desc (⇅ / ▲ / ▼ indicators)
- Sort is client-side within the current page, numeric-aware
- Dates matching ISO format are displayed as e.g. "Apr 5, 26"
- Sort resets on source change

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

ui/src/pages/Records.jsx

@@ -1,16 +1,30 @@
-import { useState, useEffect } from 'react'
+import { useState, useEffect, useMemo } from 'react'
 import { api } from '../api'
 
+const DATE_RE = /^\d{4}-\d{2}-\d{2}(T[\d:.Z+-]+)?$/
+
+function formatVal(val) {
+  if (val === null || val === undefined) return null
+  const s = String(val)
+  if (DATE_RE.test(s)) {
+    const d = new Date(s)
+    if (!isNaN(d)) return d.toLocaleDateString(undefined, { year: '2-digit', month: 'short', day: 'numeric' })
+  }
+  return s
+}
+
 export default function Records({ source }) {
   const [rows, setRows] = useState([])
   const [exists, setExists] = useState(null)
   const [offset, setOffset] = useState(0)
   const [loading, setLoading] = useState(false)
+  const [sort, setSort] = useState({ col: null, dir: 'asc' })
   const LIMIT = 100
 
   useEffect(() => {
     if (!source) return
     setOffset(0)
+    setSort({ col: null, dir: 'asc' })
     load(0)
   }, [source])
 
@@ -27,11 +41,30 @@ export default function Records({ source }) {
     }
   }
 
+  function toggleSort(col) {
+    setSort(s => s.col === col
+      ? { col, dir: s.dir === 'asc' ? 'desc' : 'asc' }
+      : { col, dir: 'asc' }
+    )
+  }
+
+  const sorted = useMemo(() => {
+    if (!sort.col) return rows
+    return [...rows].sort((a, b) => {
+      const av = a[sort.col] ?? ''
+      const bv = b[sort.col] ?? ''
+      const cmp = String(av).localeCompare(String(bv), undefined, { numeric: true })
+      return sort.dir === 'asc' ? cmp : -cmp
+    })
+  }, [rows, sort])
+
   function prev() { const o = Math.max(0, offset - LIMIT); setOffset(o); load(o) }
   function next() { const o = offset + LIMIT; setOffset(o); load(o) }
 
   if (!source) return <div className="p-6 text-sm text-gray-400">Select a source first.</div>
 
+  const cols = rows.length > 0 ? Object.keys(rows[0]) : []
+
   return (
     <div className="p-6">
       <div className="flex items-center justify-between mb-4">
@@ -59,19 +92,34 @@ export default function Records({ source }) {
             <table className="w-full text-sm">
               <thead>
                 <tr className="text-left text-xs text-gray-400 border-b border-gray-100 bg-gray-50">
-                  {Object.keys(rows[0]).map(col => (
-                    <th key={col} className="px-3 py-2 font-medium whitespace-nowrap">{col}</th>
-                  ))}
+                  {cols.map(col => {
+                    const active = sort.col === col
+                    return (
+                      <th
+                        key={col}
+                        onClick={() => toggleSort(col)}
+                        className="px-3 py-2 font-medium whitespace-nowrap cursor-pointer select-none hover:text-gray-600"
+                      >
+                        {col}
+                        <span className="ml-1 text-gray-300">
+                          {active ? (sort.dir === 'asc' ? '▲' : '▼') : '⇅'}
+                        </span>
+                      </th>
+                    )
+                  })}
                 </tr>
               </thead>
               <tbody>
-                {rows.map((row, i) => (
+                {sorted.map((row, i) => (
                   <tr key={i} className="border-t border-gray-50 hover:bg-gray-50">
-                    {Object.values(row).map((val, j) => (
+                    {cols.map((col, j) => {
+                      const formatted = formatVal(row[col])
+                      return (
                         <td key={j} className="px-3 py-2 text-xs text-gray-600 whitespace-nowrap max-w-48 truncate">
-                        {val === null ? <span className="text-gray-300">—</span> : String(val)}
+                          {formatted === null ? <span className="text-gray-300">—</span> : formatted}
                         </td>
-                    ))}
+                      )
+                    })}
                   </tr>
                 ))}
               </tbody>