## What changed
Handle `Ctrl+C` while preparing a Cloud session and before adopting its thread. Clear buffered draft input first; when no draft or modal handles cancellation, request shutdown and abandon the pending switch.
Cancel abandoned Cloud thread-start requests so they cannot replace the active attachment or block subsequent worker commands. Skip queued starts whose caller has already gone away without disturbing existing recovery.
## Testing
Add regression tests for quitting before thread adoption with pending and completed operations, clearing buffered draft input before quitting, and unblocking the Cloud worker after abandoning regular and project thread starts.
GitOrigin-RevId: 11e8cab13f00f4910a382094d5d857faf72a45bc
## Why
Cloud conversations previously used the model returned on activation without exposing model discovery or supporting model changes from the TUI.
## What changed
- Fetch the account-scoped Cloud catalog on demand through `/v2/models`, independently of the submission and attachment queue.
- Let users stage a supported model and reasoning effort for the next new turn in the current conversation. Send these settings with the user message and show acceptance after successful admission.
- Show a loading picker when the catalog is empty, preserve compatibility with Cloud servers that lack discovery, and discard stale catalog results and selections when the account changes.
## Testing
Add coverage for catalog request parameters and queue bypass, deferred discovery and compatibility, model and effort serialization, admission outcomes, account invalidation, and opening the picker after discovery.
GitOrigin-RevId: 2cd0e7fe5f760d4da9258eefe9f0dcbcd23f9b07
## Why
Cloud messages previously accepted only plain text, and switching a draft to Cloud waited for session preparation without processing composer input.
## What changed
- Support ordered text and image parts in Cloud submissions and user-message summaries, preserving attachment placeholders, image detail, and client message IDs.
- Accept inline data URLs and uploaded file IDs, including image-only messages. Reject invalid references and text spans locally, and cap encoded image requests at 3.75 MiB while retaining the existing plain-text limit.
- Keep the composer editable and redraw the TUI while Cloud prepares a conversation. Carry the latest draft, attachments, and Vim mode into the destination, retain drafts on failure, and prevent submission to the outgoing session during the handoff.
- Preserve buffered paste input and pending clipboard reads across the handoff, with connection and failure hints.
## Testing
Add regression coverage for image wire encoding, receipt identity, validation and size boundaries, draft editing during successful and failed handoffs, clipboard completion, Vim state, and attachment recovery after rejected submissions.
GitOrigin-RevId: 0cbcde0ab89ba961780b5f88456057e6b6a19cd5
Benjamin Carlsson