fix: improve default error handling #1379 #1409

[Alexj9837]

Fixes #1379
Fixes #1409

Both issues related to error handling in the REST client.

1379 - Catches 'UnauthorisedAccessErrorexplicitly instead of string-matching onBlueskyRemoteControlError`.

1409 - Expands the exception hierarchy so each
HTTP status code raises a distinct typed exception rather than bundling
everything into BlueskyRemoteControlError.

Tests

• Update tests to match new exception signatures
• Add missing coverage for 422 non-list detail response
• Add missing coverage for streaming error in run command

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.26%. Comparing base (485e0f8) to head (05150ae).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1439      +/-   ##
==========================================
+ Coverage   95.19%   95.26%   +0.07%     
==========================================
  Files          43       43              
  Lines        3119     3125       +6     
==========================================
+ Hits         2969     2977       +8     
+ Misses        150      148       -2     

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