fix(ui): improve auth key error message and suppress on startup auto-select

[thepastaclaw]

Issue

Closes #743 — On startup, DET shows a confusing "Identity doesn't have an authentication key for signing document transitions" error banner with no indication of which identity is affected.

Changes

1. Better error message: Include the identity alias/DPNS name and ID in the error, so users with multiple identities can identify which one lacks a signing key.

   Before: Identity doesn't have an authentication key for signing document transitions
   After: Identity 'my-evonode' (7xK3...) doesn't have an authentication key for signing document transitions

2. Suppress banner on auto-select: The ContactRequests and QRCodeGenerator screens auto-select the first identity during construction. If that identity lacks a document signing key (e.g., evonode identities), the error was shown immediately before the user did anything. Now these screens silently set wallet to None on auto-select — the error only appears when the user explicitly selects an identity that lacks the key.

Testing

• cargo check — clean
• cargo clippy — clean
• cargo fmt — clean

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[lklimek]

Error handling refactoring was merged to v1.0-dev. claw please check if the issues are still present, and recreate on top of v1.0-dev if needed.

[thepastaclaw]

All three issues are still present on v1.0-dev after the error handling refactor (#739). Recreated the fixes on top of v1.0-dev in #761.

Closing this one in favor of #761.