ui+server: schedule next-run / last-run on dashboard + schedules tab

P2R-14. New store.LatestJobBySchedule query (per-schedule fired job).
Schedules-tab handler computes next-fire from cron + last-fire from
the jobs table per row. Schedules table grows two columns; dashboard
host row prepends 'next 12h ago/from now' to the existing last-backup
line when a single covering schedule is the run-now candidate.

Embeds store.Schedule into scheduleRow so existing template field
references keep working without bulk renames.

web/templates/pages/host_schedules.html

@@ -33,6 +33,8 @@
         <div>Status</div>
         <div>Cron</div>
         <div>Sources</div>
+        <div>Next</div>
+        <div>Last</div>
         <div></div>
       </div>
       {{range $i, $sc := $page.Schedules}}
@@ -52,6 +54,14 @@
               <span class="tag" style="border-color: color-mix(in oklch, var(--accent), transparent 60%); color: var(--accent); {{if not $sc.Enabled}}opacity: 0.6;{{end}}">{{if $name}}{{$name}}{{else}}<span class="text-ink-fade">unknown</span>{{end}}</span>
             {{end}}
           </div>
+          <div class="mono text-[11.5px] {{if $sc.NextRun}}text-ink-mid{{else}}text-ink-fade{{end}}"
+               {{if $sc.NextRun}}title="{{$sc.NextRun.Format "2006-01-02 15:04:05 MST"}}"{{end}}>
+            {{if $sc.NextRun}}{{relTime $sc.NextRun}}{{else if not $sc.Enabled}}(paused){{else}}—{{end}}
+          </div>
+          <div class="mono text-[11.5px] {{if $sc.LastRun}}{{if eq $sc.LastStatus "failed"}}text-warn{{else}}text-ink-mid{{end}}{{else}}text-ink-fade{{end}}"
+               {{if $sc.LastRun}}title="{{$sc.LastRun.Format "2006-01-02 15:04:05 MST"}} · {{$sc.LastStatus}}"{{end}}>
+            {{if $sc.LastRun}}{{relTime $sc.LastRun}}{{else}}—{{end}}
+          </div>
           <div class="flex gap-1.5 justify-end row-action">
             {{if eq $host.Status "online"}}
               {{if $sc.Enabled}}

web/templates/partials/host_row.html

@@ -30,6 +30,9 @@
     {{- else -}}
       <span class="text-ink-fade italic">never run</span>
     {{- end -}}
+    {{- if .NextRun -}}
+      <br><span class="mono text-[10.5px] text-ink-fade" title="{{.NextRun.Format "2006-01-02 15:04:05 MST"}}">next {{relTime .NextRun}}</span>
+    {{- end -}}
   </div>
   <div class="text-right mono {{if eq $h.Status "offline"}}text-ink-mid{{else}}text-ink{{end}}">{{bytes $h.RepoSizeBytes}}</div>
   <div class="text-right mono {{if eq $h.Status "offline"}}text-ink-mute{{else}}text-ink-mid{{end}}">