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_sources.html

@@ -29,7 +29,8 @@
     <div class="panel rounded-[7px] overflow-hidden">
       {{range $i, $row := $page.Groups}}
         {{$g := $row.Group}}
-        <div class="src-row {{if not (eq $i 0)}}hairline{{end}}">
+        <div class="src-row clickable {{if not (eq $i 0)}}hairline{{end}}">
+          <a href="/hosts/{{$host.ID}}/sources/{{$g.ID}}/edit" class="row-link" aria-label="Edit {{$g.Name}}">{{$g.Name}}</a>
           <div>
             <div class="flex items-center" style="gap: 10px;">
               <span class="tag mono" style="border-color: color-mix(in oklch, var(--accent), transparent 60%); color: var(--accent);">{{$g.Name}}</span>
@@ -52,7 +53,7 @@
               {{if gt $row.SnapshotCount 0}} · <span class="mono">{{$row.SnapshotCount}}</span> snapshot{{if ne $row.SnapshotCount 1}}s{{end}}{{end}}
             </div>
           </div>
-          <div class="flex justify-end" style="gap: 6px;">
+          <div class="flex justify-end row-action" style="gap: 6px;">
             {{if and (gt (len $g.Includes) 0) (eq $host.Status "online")}}
               <button class="btn btn-primary"
                       hx-post="/hosts/{{$host.ID}}/source-groups/{{$g.ID}}/run"
@@ -62,7 +63,6 @@
               <button class="btn" disabled
                       title="{{if eq (len $g.Includes) 0}}add at least one include path before running{{else}}host is offline{{end}}">Run now</button>
             {{end}}
-            <a href="/hosts/{{$host.ID}}/sources/{{$g.ID}}/edit" class="btn">Edit</a>
             {{if gt $row.UsedBy 0}}
               <button class="btn btn-danger" disabled
                       title="remove this group from {{$row.UsedBy}} schedule{{if ne $row.UsedBy 1}}s{{end}} first">Delete</button>