refactor(llc, core)!: route hide, show and delete channel through the generated client

[VelikovPetar]

Linear: FLU-911

What

Moves hiding, showing and deleting a channel onto the OpenAPI-generated client.

• StreamChatClient.hideChannel, showChannel and deleteChannel, and Channel.hide, show and delete, return Result<HideChannelResponse>, Result<ShowChannelResponse> and Result<DeleteChannelResponse> instead of throwing.
• StreamChannelListController.deleteChannel (flutter_core) returns the Result too.
• ChannelsRepository gains the three operations; channels_mapper.dart gains the envelope mappers. The deleted channel goes through the existing ChannelResponse mapper.
• New freezed envelopes in models/response/. DeleteChannelResponse.channel is nullable, as the spec declares it.
• StreamChatApi.channel.hideChannel, showChannel and deleteChannel are removed.
• Sample app: the three delete flows check the Result and stay on the screen when the delete fails, as they did when it threw.

Generated	Public
DefaultApi.hideChannel (POST /api/v2/chat/channels/{type}/{id}/hide)	StreamChatClient.hideChannel
DefaultApi.showChannel (POST /api/v2/chat/channels/{type}/{id}/show)	StreamChatClient.showChannel
DefaultApi.deleteChannel (DELETE /api/v2/chat/channels/{type}/{id})	StreamChatClient.deleteChannel
HideChannelResponse / ShowChannelResponse / DeleteChannelResponse	same names (ours, freezed)

Why

The calls take the API's envelopes rather than EmptyResponse, so a field the API adds later reaches callers without another break. The v2 routes are the same backend handlers as v1, and none is gated or in beta.

Notes

• hard_delete is not exposed: the server refuses it from a client-side token, and v10 never sent it.
• showChannel now sends no body where v1 sent {}; the server accepts both.
• The read and delivery receipts (markRead family, markAllRead, markChannelsDelivered) are not part of this PR.
• Plan: group 16 "Channel Lifecycle" is split out of group 11.

Testing

• stream_chat analyze clean, full suite green (1,957 tests). flutter_core green (385), and the other packages and the sample app analyze clean. generate_plan.py --check reports 0 problems.
• New client tests: client_hide_channel_test.dart, client_show_channel_test.dart and client_delete_channel_test.dart.
• Live v1 vs v2 parity on the demo app, on throwaway channels deleted afterwards. Hide (with and without clear_history), show and delete answer the same. The deleted channel maps identically to the v1 decode, and hard_delete is refused on both.

🤖 Generated with Claude Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.67%. Comparing base (6e4f7ed) to head (2381cac).

Additional details and impacted files

@@                         Coverage Diff                          @@
##           refactor/channel_response_mapper    #3045      +/-   ##
====================================================================
+ Coverage                             78.66%   78.67%   +0.01%     
====================================================================
  Files                                   481      484       +3     
  Lines                                 29380    29383       +3     
====================================================================
+ Hits                                  23112    23118       +6     
+ Misses                                 6268     6265       -3     

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