feat(tournaments): make finished games in previous rounds clickable

Load all completed rounds in parallel when a tournament is expanded
and display them below the current round. Each finished game row is
clickable and navigates to the existing game review view. A 'Review'
label fades in on hover to signal interactivity.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/pages/tournaments/tournaments.component.html

@@ -186,6 +186,35 @@
                   </section>
                 }
 
+                <!-- Previous rounds -->
+                @if (previousRoundsLoading) {
+                  <div class="state-msg small"><span class="pulse"></span>Loading previous rounds…</div>
+                }
+                @for (rp of previousRoundPairings; track rp.round) {
+                  <section class="detail-section">
+                    <h3 class="detail-heading">Round {{ rp.round }} pairings</h3>
+                    <div class="pairings-list">
+                      @for (p of rp.pairings; track pairingKey(p)) {
+                        @let gid = firstGameId(p);
+                        <div class="pairing-row" [class.is-watchable]="!!gid"
+                          (click)="gid && watchGame(gid)">
+                          <span class="pairing-white">{{ p.white?.name ?? 'Bye' }}</span>
+                          <span class="pairing-vs">vs</span>
+                          <span class="pairing-black">{{ p.black.name }}</span>
+                          @if (p.winner) {
+                            <span class="pairing-result" [class]="'result-' + p.winner">
+                              {{ p.winner === 'draw' ? '½–½' : p.winner === 'white' ? '1–0' : '0–1' }}
+                            </span>
+                          }
+                          @if (gid) {
+                            <span class="pairing-review">Review</span>
+                          }
+                        </div>
+                      }
+                    </div>
+                  </section>
+                }
+
               </div>
             }
           </div>