feat: clickable count badges on entity cards

[Flo0806]

Summary

• Count badges on entity cards are now clickable and open the edit dialog at the corresponding tab
• Fixed bug where group chips would disappear after saving edit dialogs
• Fixed faction-to-faction relation counts not updating bidirectionally
• Centralized GroupInfo type definition

Changes

Clickable Badges

• NPCs, Items, Factions, Lore, Players, Groups cards now have clickable count badges
• Clicking a badge opens the edit dialog directly at the relevant tab

Bug Fixes

• Individual counts endpoints now return groups (consistent with batch-counts)
• Faction delete now returns affectedFactionIds to update linked factions
• Faction-to-Faction relations now update both factions' counts (add/remove/delete)

Refactoring

• GroupInfo type moved to central types/group.ts
• FactionEditDialog now uses store's loadFactionCounts() instead of custom function

Closes #199