Fix RSS time filters and add draggable grid layout

Normalize pub_date to ISO 8601 on insert so SQLite datetime comparisons
work correctly. Migrate existing RFC 2822 dates. Change 1h filter to 12h.
Add react-grid-layout with persistent drag/resize and reset button.

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

components/widgets/UptimeCard.tsx

@@ -3,6 +3,7 @@
 import { Activity, RefreshCcw, AlertCircle, X, Plus, Trash2, ExternalLink, ChevronDown, ChevronUp, Pencil, Check } from 'lucide-react';
 import { useState, useEffect, useCallback, useRef } from 'react';
 import { format, subHours, subDays, subMonths } from 'date-fns';
+import { useLayoutContext } from '@/components/dashboard/GridShell';
 
 // --- Types ---
 
@@ -592,14 +593,20 @@ export function UptimeCard() {
         }
     };
 
-    const rowSpan = expanded ? 'row-span-2' : 'row-span-1';
+    const { updateWidgetSize } = useLayoutContext();
     const [leftLabel, rightLabel] = rangeEdgeLabels(timeRange);
 
+    const handleToggleExpand = useCallback(() => {
+        const next = !expanded;
+        setExpanded(next);
+        updateWidgetSize('uptime', 2, next ? 2 : 1);
+    }, [expanded, updateWidgetSize]);
+
     return (
         <>
-            <div className={`col-span-1 md:col-span-2 lg:col-span-2 ${rowSpan} bg-neutral-900 border border-neutral-800 rounded-xl p-5 flex flex-col hover:border-neutral-700 transition-all duration-300 overflow-hidden`}>
+            <div className="h-full bg-neutral-900 border border-neutral-800 rounded-xl p-5 flex flex-col hover:border-neutral-700 transition-all duration-300 overflow-hidden">
                 {/* Header */}
-                <div className="flex justify-between items-center shrink-0 mb-3">
+                <div className="widget-drag-handle flex justify-between items-center shrink-0 mb-3">
                     <div className="flex items-center gap-2 text-neutral-400">
                         <Activity size={18} />
                         <span className="text-sm font-medium">Uptime Monitor</span>
@@ -608,7 +615,7 @@ export function UptimeCard() {
                     <div className="flex items-center gap-2">
                         <TimeRangeSelector value={timeRange} onChange={handleTimeRangeChange} />
                         <button
-                            onClick={() => setExpanded(!expanded)}
+                            onClick={handleToggleExpand}
                             className="text-neutral-500 hover:text-neutral-300 transition-colors p-1 rounded-lg hover:bg-neutral-800"
                             title={expanded ? 'Collapse' : 'Expand'}
                         >