Fixed session intitialization

[UnluckyBird]

Fixed initialization
Implemented deniable identity store
Started key ids from 1 instead of 0

[Copilot]

Pull Request Overview

This PR introduces support for a deniable identity key store alongside existing identity flows, adjusts key ID initialization to start from 1, and adds a helper to extract a contact’s display name from a processed envelope.

• Added try_get_name_as_string to ProcessedEnvelope for easier contact name retrieval.
• Implemented new save/is_trusted/get_deniable_identity methods and wired a DeniableIdentityKeyStore through the storage stack and client.
• Changed default key ID start value in KeyManager from 0 to 1 and updated related tests.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
common/src/envelope.rs	Added try_get_name_as_string, unwraps first contact display.
client/src/storage/in_memory.rs	Forwarding methods for deniable identity operations.
client/src/storage/generic.rs	Introduced deniable_identity_key_store in ProtocolStore.
client/src/storage/device.rs	SQL table CRUD for deniable identities; new trait impls.
client/src/storage/database.rs	Expanded ClientDB trait with deniable identity methods; new DeniableIdentityKeyStore.
client/src/main.rs	Removed old name map, updated login/register to include alias, updated receive/display logic.
client/src/key_manager.rs	Changed initial key counters to 1 and updated tests accordingly.
client/src/client.rs	Added alias to Client, populated contact lists, wired deniable identity store in encryption/decryption paths.
client/client_db/migrations/02-denim/*	Created/dropped DeniableDeviceIdentityKeyStore table.

Comments suppressed due to low confidence (3)

client/src/storage/device.rs:490

• Calling .expect on a database operation can panic in production. It would be safer to propagate or map this error to SignalProtocolError instead of unconditionally panicking.

.await.expect("This function cannot return err")

client/src/storage/device.rs:565

• The try_into()? conversion error isn't mapped to SignalProtocolError, which may lead to an unexpected error type. Consider wrapping this in .map_err(...) to return a consistent error variant.

.as_slice().try_into()?,

client/src/storage/device.rs:443

• No unit tests cover save_deniable_identity, is_trusted_deniable_identity, or get_deniable_identity. Adding tests would ensure new database logic is verified and prevent regressions.

async fn save_deniable_identity(

[andreasalstrup]

LGTM