refactor(web): composer context imports live in useComposerContextImport

Moves importing copied context records (terminal output, review comments,
annotations, threads, images and files) and the attachment slot count out
of the composer body. The hook reads the draft store adders itself.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
d7b37b81c3Julius Marminge committed on 10/21/2026, 7:20:05 PMparent25fa572

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