app: a takeover request that cannot be read is deleted with no log line #2554

Seen on macOS 15.6 during the Mac proof for #2551 (app/v3 32747af; the same code is at f508fec). Low priority.

What happens: takeoverAsked (internal/session/takeover.go, around line 173) removes takeover.json without a word when it can't be parsed or its at is zero, the same way it drops a stale request. The session never learns that someone asked to take the chat. No log line or wire event says the request was dropped. The window that asked waits for a move that never comes.

Replication:

1. Hold a chat in codeaf app.
2. Publish a request the way AskTakeover does: write .takeover-x.json in the chat's folder, then rename it to takeover.json. Give it an offset without the colon, e.g. {"at":"2026-11-09T17:00:00-0500"}. That isn't RFC 3339, so json.Unmarshal into time.Time fails.
3. The file disappears within milliseconds. There's no agent.changed and no log line. With -05:00 the same request moves the chat at once.

Expected: a dropped request leaves at least a log line saying why (unreadable, missing time, or stale), so a failed move can be traced. Whether an unreadable request should still count as a request is a separate question.

Only AskTakeover and internal/syncsetup/take.go write this file, and both write RFC 3339, so this matters mostly for diagnosis and for any future writer.

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