sendPrompt failure leaves the optimistic bubble with no error / retry state

[aasis21]

Problem

sendPrompt appends the user bubble optimistically, then await client.send(prompt(text)) with no catch. If the send fails (offline/relay error), the bubble stays as if delivered — no error icon, no retry. The agent never got it.

Suggested fix

Mark the message as failed on send rejection and offer "tap to retry" (à la iMessage/ChatGPT "Not delivered").

Where

mobile/src/lib/sessionManager.ts (sendPrompt, ~372–379).

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Filed from a UI research sweep of the Helm mobile app (landing + live demo session) using Playwright + full source review, cross-referenced against Claude, ChatGPT, GitHub Copilot Chat, and Codex/Claude Code UIs.

[aasis21]

Fixed on \main\ in commit 4262060 as part of the P1 UI sweep (wave 1). This issue was implemented but not auto-closed because GitHub only honors the closing keyword before the first issue in a multi-issue \Closes\ line.