fix(web): stop pinning resolved permission cards to the bottom of the chat

[junmo-kim]

Problem

After an AskUserQuestion (or other permission prompt) is answered, its card can stay pinned at the bottom of the chat — sitting just above the composer instead of resting in its place in the conversation history. Over a session with several answered prompts these cards pile up at the bottom.

The chat keeps an answered request in agentState.completedRequests. When that request's tool_use message is not in the currently loaded window, reduceChatBlocks synthesizes a stand-in card for it and appends it to the end of the timeline. There is no chronological re-sort, so the synthesized card stays at the bottom. That stand-in is meant for a pending request — so it remains answerable even before its message loads — but it also fired for already-resolved requests, pinning a stale "answered" card above the composer.

Solution

Synthesize a stand-in card only for a pending request. A resolved request (approved / denied / canceled) is history: it renders through its own tool message when that message is in the window, and no longer leaves a bottom-pinned stand-in when it isn't. Pending requests are unchanged — they still get an answerable card when their message hasn't loaded yet.

Tests

Unit tests in reducer.test.ts: a resolved request with no in-window message is no longer synthesized as a card, while a pending request with no in-window message still is. Existing reducer tests pass. Manually verified end-to-end: a session whose answered AskUserQuestion requests were pinned at the bottom no longer shows them there, while a pending question still renders its answerable card.

[github-actions]

Findings
No issues found in the changed lines.

Summary
Review mode: initial
No correctness, security, data-loss, performance, or maintainability regressions found in this diff. Residual risk: I could not run the web reducer test locally because bun is not installed in this runner.

Testing
Not run (automation): bun --cwd web test src/chat/reducer.test.ts failed with bun: command not found.

HAPI Bot