Payla: Split Group Expenses

This version makes Payla clearer and calmer. • Your standing now sits in one card on Home: see at a glance whether you're owed or owe across all your groups, with what you're owed and what you owe shown separately. • No more 0 while a group or Home loads. Amounts roll into place when they arrive. • Tap any row in a group's analytics for the details: your share, categories, biggest expenses and who paid what, with charts. (Pro) • The "Where you stand" card now shows your tasks: how many you have, how many you've done, and the group's total. • To settle up, tap the Payla button. • Change your name whenever you like. Everyone in your groups sees the new one, in past payments too. • Dates look the same everywhere. • Simpler buttons, a smaller "Remind" and fixes: category names now show in English, and the tab bar no longer slides when you tap the last tab.