Chat Interaction State Polish

Goal

Make question suggestions, session navigation, the model selector, and the credit indicator behave predictably without changing chat billing or allowing concurrent sends.

Approved behavior

Initial question cards remain visible while a user types or selects a question. They disappear only when the first user message is submitted.
Follow-up suggestions remain visible while a user types or selects one. The current set disappears when the next user message is submitted; the next assistant answer may provide a new set.
Existing sessions remain selectable while another session has a pending request. The pending request continues against its original session, while all new sends remain globally locked until it settles.
The model popover width is reduced from 360px to 180px, with viewport collision protection retained.
The credit icon and number share the same visual center using the existing flex layout and a compact line box.

Architecture

Keep the current session-scoped request routing and billing locks. Correct only the UI guards: suggestion visibility follows submitted message state rather than draft state, session navigation no longer inherits the send lock, and CSS uses existing design tokens for the two layout adjustments.

Error and cancellation behavior

Cancellation remains unchanged. If a send is withdrawn before output and the optimistic user message is removed, the previous suggestion set can reappear with the restored draft.

Verification

Contract tests cover draft-independent initial and follow-up suggestions, unlocked session navigation, the 180px popover, and credit alignment.
Run the full frontend test suite, TypeScript, ESLint, production build, and a local preview interaction check.

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