P2R-02 follow-up: clickable rows on Sources/Schedules + cron-preset tooltips

Aligns Sources and Schedules tab rows with the dashboard's row-click
UX: whole-row click navigates to the row's edit page (mirroring
.host-row.clickable). Drops the redundant Edit buttons; Run-now and
Delete remain in .row-action cells that sit above the row-link
overlay via z-index.

Schedule edit form's cron preset chips now carry human-readable
title= tooltips ("Every day at 03:00", "Every Sunday at 03:00", etc).

tasks.md gets a binding row-design rule covering all current and
future list-row templates, and the P2R-02 entry is split into the
six slices already agreed with the operator (slices 1–3 marked
done, 4 next).

web/templates/pages/host_schedules.html

@@ -36,7 +36,8 @@
         <div></div>
       </div>
       {{range $i, $sc := $page.Schedules}}
-        <div class="schd-row {{if not (eq $i 0)}}hairline{{end}}">
+        <div class="schd-row clickable {{if not (eq $i 0)}}hairline{{end}}">
+          <a href="/hosts/{{$host.ID}}/schedules/{{$sc.ID}}/edit" class="row-link" aria-label="Edit schedule">edit</a>
           <div>
             {{if $sc.Enabled}}
               <span class="mono text-[11px] text-ok">enabled</span>
@@ -51,14 +52,13 @@
               <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="flex gap-1.5 justify-end">
+          <div class="flex gap-1.5 justify-end row-action">
             {{if and $sc.Enabled (eq $host.Status "online")}}
               <button class="btn btn-primary"
                       hx-post="/hosts/{{$host.ID}}/schedules/{{$sc.ID}}/run"
                       hx-swap="none"
                       hx-disabled-elt="this">Run now</button>
             {{end}}
-            <a href="/hosts/{{$host.ID}}/schedules/{{$sc.ID}}/edit" class="btn">Edit</a>
             <form method="post" action="/hosts/{{$host.ID}}/schedules/{{$sc.ID}}/delete" style="display: inline;"
                   onsubmit="return confirm('Delete this schedule? Existing snapshots are not affected.');">
               <button type="submit" class="btn btn-danger">Delete</button>