Favorite team: star a side, get its next match pinned on Live

A star on the team page (localStorage, no accounts) pins that team's
next or running match in a My team section at the top of the Live tab.
EN/DE strings + aria-pressed on the toggle.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/lib/i18n/en.ts

@@ -65,6 +65,7 @@ export const en = {
     nextUp: "Next up",
     nextUpDay: "Next up · {day}",
     comingUp: "Coming up",
+    myTeam: "My team",
     latestResults: "Latest results",
     empty: "The schedule is ready. Matches will appear here once the tournament kicks off.",
   },
@@ -370,6 +371,8 @@ export const en = {
   team: {
     unknown: "Unknown team.",
     allTeams: "All teams",
+    follow: "Follow this team",
+    unfollow: "Unfollow this team",
     eloBadge: "Elo {rating}",
     titleOddsBadge: "Title {pct}",
     advanceOddsBadge: "Advance {pct}",