fix(web): notices, day numbers and «Responder» as tall as they are

@pi/ui gives every button a fixed height, side padding and a minimum
width. Three of ours, laid out by their own component, took it:
- a notice in the bell's panel stayed 40 px tall, so a two-line one ran
  over the next;
- a day number in the calendar became a 40 px pill that ran into the
  sprint bands under it (today's, coloured, showed it);
- «Responder» under a comment became a grey pill sitting on its line.
They keep their own box now, and «Responder» is a text link.

The home page shows my projects first, right under the greeting: what
most visits come to open.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/web/tracker/presenters/src/lib/pages/issue.page.scss

@@ -533,9 +533,24 @@ a.ts-key {
   font-style: italic;
 }
 
+// A text link, past @pi/ui's global button look: as a 40 px pill it sat on
+// the line under the comment.
 .ts-reply__open {
   justify-self: start;
+  height: auto !important;
+  min-width: 0 !important;
+  margin-top: 0.375rem;
+  padding: 0.125rem 0 !important;
+  border: 0;
+  background: none !important;
+  color: var(--ts-brand);
   font-size: 0.8125rem;
+  font-weight: 600;
+  cursor: pointer;
+
+  &:hover {
+    text-decoration: underline;
+  }
 }
 
 .ts-reply__actions {