fix(ui): restore user-solver chat exports after merge

[arkanoider]

Summary

• Re-export UserChatChannel from crate::ui and restore missing imports (save_user_dispute_chat_message, FOOTER_MYTRADES_TAB_CHAT) broken by the feat(chat): add user-to-solver dispute chat #119 merge.
• Restore My Trades Tab / BackTab peer↔solver chat toggling that was dropped during the merge conflict resolution.

Test plan

• cargo fmt --all
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-features
• cargo build --all-features
• Manually: on My Trades with an assigned solver, Tab/BackTab switches Peer ↔ Solver chat; without a solver, Tab stays on Peer.

Made with Cursor

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📥 Commits

Reviewing files that changed from the base of the PR and between f37d836 and b94d4a6.

📒 Files selected for processing (4)

• src/ui/key_handler/enter_handlers.rs
• src/ui/key_handler/navigation.rs
• src/ui/mod.rs
• src/ui/tabs/order_in_progress_tab.rs

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