feat: link commits, branches and pull requests to tickets

A project can turn on a webhook for GitHub, Gitea or GitLab. Pushes and
pull or merge requests that name a ticket key show on that ticket under
Desarrollo, with the state of each pull request; the secret is shown and
rotated from the project settings.

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

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

@@ -467,3 +467,56 @@ a.ts-key {
 .ts-mentions__option:focus-visible {
   border-color: currentColor;
 }
+
+// Code that mentions the ticket (from the Git integration).
+.ts-dev {
+  display: grid;
+  gap: 0.25rem;
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+
+.ts-dev__item {
+  display: grid;
+  grid-template-columns: 4rem minmax(0, 1fr) auto auto auto;
+  gap: 0.625rem;
+  align-items: center;
+  padding: 0.375rem 0;
+  border-top: 1px solid var(--ts-line);
+
+  @media (max-width: 640px) {
+    grid-template-columns: 4rem minmax(0, 1fr);
+
+    .ts-dev__ref,
+    .ts-dev__when {
+      display: none;
+    }
+  }
+
+  .ts-pill[data-state='MERGED'] {
+    --tone: var(--ts-c-violet, var(--ts-brand));
+  }
+
+  .ts-pill[data-state='OPEN'] {
+    --tone: var(--ts-c-green, var(--ts-brand));
+  }
+}
+
+.ts-dev__kind {
+  color: var(--ts-muted);
+  font-size: 0.75rem;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+}
+
+.ts-dev__title {
+  overflow: hidden;
+  color: inherit;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.ts-dev__when {
+  font-size: 0.8125rem;
+}