## What
Updates the transaction filters popover:
- **Reordered** the filter sections to: **Date, Amount, Category,
Labels, Accounts, AI, Counterparties**.
- **Accounts** now use a searchable dropdown (the same pattern as
Categories/Labels) instead of toggle badges. Each option shows the
**bank logo** as its icon (with a `Building2` fallback for accounts
without a logo/bank).
## Why
The badge list didn't scale well with many accounts and was visually
inconsistent with the other multi-select filters. A dropdown keeps the
popover compact and adds search.
## Notes
- Fixed `handleAccountToggle` parameter type (`number` → `UUID`) to
match `accountIds`.
- Each account `CommandItem` uses a unique `value` (`name + id`) so
accounts that share a name aren't collapsed by cmdk's default filtering.
- Added Spanish translations for the new keys (`Select accounts...`,
`Search accounts...`).
## Tests
- New `transaction-filters.test.tsx` covering select/deselect of an
account and the empty state.
- Full front-end suite green (244 tests), ESLint/Prettier clean,
localization test passes.
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