test: enable player schedule tests with match data setup

Related to #9

- Implemented 'I have upcoming matches in my schedule' step to create
  tournament, players, and match with future date
- Added step definitions for schedule content verification
- 2 player schedule scenarios now active (empty schedule, upcoming matches)
- 'Click on match' scenario remains @wip (page lacks match detail links)

Player schedule page at /players/[id]/schedule shows upcoming matches
with tournament name, player names, and dates.

e2e/cucumber/features/player-schedule.feature

@@ -9,7 +9,7 @@ Feature: Player Schedule
     When I go to my schedule page
     Then I should see "No upcoming matches"
 
-  @happy-path @player-features @issue-9 @wip
+  @happy-path @player-features @issue-9
   Scenario: Player views schedule with upcoming matches
     Given I am logged in as a player
     And I have upcoming matches in my schedule