ui: datastore: show comment, allow to edit notes

the "comment" is the first line of the "notes" field from a manifest,
show it in the grid and allow editing the full notes.

Hack the click event listener a bit together for the right aligned
edit action button, but it works out well and is efficient (only one
event listener is much cheaper than per-buttons ones).

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

www/css/ext6-pbs.css

@@ -213,6 +213,13 @@ p.logs {
     cursor: default;
 }
 
+span.snapshot-comment-column {
+    text-overflow: ellipsis;
+    overflow: hidden;
+    display: inline-block;
+    width: calc(100% - 18px);
+}
+
 .x-action-col-icon.good:before {
     color: #21BF4B;
 }