Release v0.2.1 — Transactions edit/delete + tombstone sync + UX audit · AkashPriyadarshii/kharcha

v0.2.1 — Transactions edit/delete + tombstone sync + UX audit

Edit — every transaction tile now has an edit pencil; tapping it reuses the add form prefilled with that transaction's data. Save runs updateTransaction (marks the row dirty → overwrites the remote on next push).
Delete — trash icon with a confirm dialog; runs deleteTransaction.
Sync-correct deletes — a new deleted_transactions tombstone table (schema v8) records the remote row id when a pushed transaction is deleted locally. On the next sync:
1. Push DELETEs those remote rows first (before any pulls)
2. Pull skips tombstoned ids entirely
  → A deleted expense can never resurrect from Supabase.
  Unsynced rows (no remote id yet) vanish locally with no tombstone.

Categories screen: expense categories and income categories now grouped into separate sections.
Wallets: tap no longer opens a delete dialog; rename via trailing edit icon only.
Subscriptions: delete button with confirm dialog + actionable empty state.
Debts / Objectives: delete confirm dialogs.
Transactions list: income rows show a glyph badge (arrow_downward) — not color-only, colorblind-safe.