fix(web): the ticket page fits a phone again

Its main column was a grid without columns, so it grew to the width of
its widest form field (650 px on a 390 px screen) and cut the text.

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

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

@@ -24,6 +24,9 @@
 
 .ts-issue__main {
   display: grid;
+  // Without it the column takes the width of its widest field: on a phone,
+  // wider than the screen.
+  grid-template-columns: minmax(0, 1fr);
   gap: 2rem;
   min-width: 0;
 }