Carry over rolling preset id to popout tabs and add range controls to standalone Metrics/Dashboards

Popped-out tabs now carry the active TimeRangePresetId (e.g. "5m") via a
`preset` query param instead of only resolved absolute startMs/endMs, so a
rolling preset keeps independently sliding in the new tab on its own polling
cadence rather than freezing to the source tab's window at open time. A
fixed/dragged range is still carried over as absolute bounds. StandaloneRanged
(metrics/dashboards standalone pages) now owns its own preset/range state and
renders LogTimeline for its own preset buttons and drag-to-select UI, instead
of only ever showing a frozen, uncontrollable range. log and params standalone
pages are unchanged.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

webapp/src/components/Metrics.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react'
-import type { TimeRange } from './LogTimeline'
+import type { TimeRange, TimeRangePresetId } from './LogTimeline'
 import {
   ApiError,
   declareMetric,
@@ -69,7 +69,7 @@ function sparkline(values: BucketValue[], range: TimeRange | null): string {
   return slots.map((count) => SPARK_CHARS[Math.round((count / max) * (SPARK_CHARS.length - 1))]).join('')
 }
 
-export function Metrics({ range }: { range: TimeRange | null }) {
+export function Metrics({ range, activePreset }: { range: TimeRange | null; activePreset?: TimeRangePresetId | null }) {
   const [metrics, setMetrics] = useState<MetricDeclaration[]>([])
   const [selected, setSelected] = useState<string | null>(null)
   const [bucketValues, setBucketValues] = useState<BucketValue[]>([])
@@ -158,7 +158,7 @@ export function Metrics({ range }: { range: TimeRange | null }) {
         </div>
         <div className="flex items-center gap-1.5">
           <CollapseToggle collapsed={collapsed} onToggle={() => setCollapsed(!collapsed)} />
-          <PopOutButton section="metrics" range={range} />
+          <PopOutButton section="metrics" range={range} activePreset={activePreset} />
         </div>
       </div>
       <div className="flex gap-4 p-3" hidden={collapsed}>