Fix lit() truncating decimals; restore last selected stack on load

- lit() was calling Math.trunc() on numbers, dropping decimals from balance_offset and any other numeric SQL params
- Stacks page now saves last selected stack to localStorage and restores it on load

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

api/lib/sql.js

@@ -8,7 +8,7 @@
 function lit(val) {
     if (val === null || val === undefined) return 'NULL';
     if (typeof val === 'boolean') return val ? 'TRUE' : 'FALSE';
-    if (typeof val === 'number') return String(Math.trunc(val));
+    if (typeof val === 'number') return String(val);
     if (typeof val === 'object') return `'${JSON.stringify(val).replace(/'/g, "''")}'`;
     return `'${String(val).replace(/'/g, "''")}'`;
 }

ui/src/pages/Stacks.jsx

@@ -658,17 +658,24 @@ export default function Stacks({ sources, onStackStale, onStackViewGenerated })
   async function load() {
     const s = await api.getStacks()
     setStacks(s)
+    return s
   }
 
   async function loadDetail(name) {
     const s = await api.getStack(name)
     setStackDetail(s)
     setSelected(name)
+    localStorage.setItem('stacks_last_selected', name)
     setSqlDraft('')
     setSqlResult(null)
   }
 
-  useEffect(() => { load() }, [])
+  useEffect(() => {
+    load().then(s => {
+      const last = localStorage.getItem('stacks_last_selected')
+      if (last && s.find(x => x.name === last)) loadDetail(last)
+    })
+  }, [])
   useEffect(() => { if (selected) loadDetail(selected) }, [selected])
 
   async function createStack() {