## Why
Transactions and account names used to be stored encrypted client-side.
They now live **unencrypted in the backend**, so the browser no longer
needs to encrypt, decrypt, or mask them. A handful of legacy accounts
may still have encrypted transactions, but the auto-run
decrypt-migration handles those — so this PR strips the now-dead
encryption machinery while keeping the migration path fully intact.
Net: **−1213 / +176** lines across 25 files.
## Removed (dead machinery)
- `setup-encryption` page, `POST /api/encryption/setup`,
`SetupEncryptionRequest`, and `encrypt()` / `generateSalt()` — new data
is never encrypted again
- `EncryptedText` and the decrypt-on-render description component →
replaced by a plaintext `TransactionDescription` that keeps the
privacy-mode fake labels
- All `isKeySet`-gated client decryption: transaction list (load /
search / sort), categorize flow, import dedup
- `isKeySet` masking / locking on amount display, app logo, import
button, add-transaction button, account page, and filters
- The unused `?encrypted=false` API filter and `isKeyPersistent()`
## Kept (legacy decrypt-migration)
- The two migration hooks, the unlock dialog, and the dashboard/login
unlock prompt
- `decrypt` / `importKey` + key derivation, key-storage,
`EncryptedMessage`, salt, `GET /api/encryption/message`,
`?encrypted=true`, and the middleware salt-cleanup
- `rule-engine` / edit / import-drawer account-name decryption —
plaintext-first (`if (!account.encrypted) return name`) legacy fallback
on the kept primitives; intentionally untouched
## Testing
- Pint ✅ · ESLint ✅ · Prettier ✅
- 184 vitest tests ✅
- 1425 PHP Feature/Unit tests ✅ (Browser suite not run locally — needs
`bun run build`; no Browser test references the encryption UI)
## Follow-up (out of scope)
`DecryptedTransaction.decryptedDescription` / `decryptedNotes` are now
just plaintext aliases. Collapsing that type touches 13+ files (rule
engine, categorizer, edit dialog) and was left as a separate cleanup.
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