feat(TeamManagementView): enhance league validation logic for team management

- Updated league validation to consider both leagueId and plannedLeagueName, allowing for more flexible team management workflows.
- Adjusted missing items logic to reflect the new validation criteria, improving user feedback on required fields.
- Enhanced tooltip and state management to accurately represent league requirements based on the updated validation rules.

frontend/src/views/TeamManagementView.vue

@@ -1498,7 +1498,7 @@ export default {
       teamFormIsOpen.value = true;
       activeEditorSection.value = 'basic';
 
-      if (!team.leagueId) {
+      if (!team.leagueId && !String(team?.plannedLeagueName || '').trim()) {
         await showInfo(
           t('teamManagement.editTeam'),
           t('teamManagement.leagueFieldRequired'),
@@ -2235,6 +2235,9 @@ export default {
 
       const hasTeamId = !!team.myTischtennisTeamId;
       const hasLeague = !!team.league;
+      const hasPlannedLeague = !!String(team?.plannedLeagueName || '').trim();
+      // Für den Planungs-Workflow gilt ein geplanter Liga-Text als valider Zwischenstand.
+      const hasLeagueForWorkflow = hasLeague || hasPlannedLeague;
       const hasLeagueConfig = hasLeague &&
         !!team.league.myTischtennisGroupId &&
         !!team.league.association &&
@@ -2242,13 +2245,13 @@ export default {
 
       const missingItems = [];
       if (!hasTeamId) missingItems.push(t('teamManagement.teamId'));
-      if (!hasLeague) missingItems.push(t('teamManagement.league'));
+      if (!hasLeagueForWorkflow) missingItems.push(t('teamManagement.league'));
       if (hasLeague && !team.league.myTischtennisGroupId) missingItems.push(t('teamManagement.groupId'));
       if (hasLeague && !team.league.association) missingItems.push(t('teamManagement.association'));
       if (hasLeague && !team.league.groupname) missingItems.push(t('teamManagement.groupName'));
 
       const complete = hasTeamId && hasLeagueConfig;
-      const partial = (hasTeamId || hasLeagueConfig) && !complete;
+      const partial = (hasTeamId || hasLeagueConfig || hasPlannedLeague) && !complete;
 
       let tooltip = '';
       if (complete) {
@@ -2267,7 +2270,7 @@ export default {
         missing: missingItems.length > 0 ? t('teamManagement.missingItems', { items: missingItems.join(', ') }) : '',
         missingItemLabels: [...missingItems],
         tooltip,
-        needsLeague: !hasLeague,
+        needsLeague: !hasLeagueForWorkflow,
         needsTeamId: !hasTeamId,
         needsLeagueGroupId: !!(hasLeague && !team.league.myTischtennisGroupId),
         needsLeagueAssociation: !!(hasLeague && !team.league.association),