fix(ui): include identity name in auth key error message

[thepastaclaw]

Summary

When an identity lacks an authentication key for signing document transitions, the error banner now includes the identity alias (or base58 ID if no alias) so users can tell which identity has the issue.

Before: Identity doesn't have an authentication key for signing document transitions
After: Identity 'MyEvonode' doesn't have an authentication key for signing document transitions

This is especially helpful for users with many identities (the reporter has 16).

Closes #743

Changes

• src/ui/identities/mod.rs: Use format!() with display_string() instead of static string
• src/backend_task/identity/register_dpns_name.rs: Same — also switched from .ok_or() to .ok_or_else() to avoid eager allocation

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[thepastaclaw]

Superseded by #750 which includes this fix plus suppresses the error on startup auto-select.