Discord's ExecApprovalView, SlashConfirmView, UpdatePromptView, and
ClarifyChoiceView hardcoded timeout=300, ignoring approval timeout
configuration. All four now read approvals.discord_prompt_timeout from
config.yaml (default 300s, clamped 30-900s — Discord interaction tokens
expire at ~15 min, so values beyond 900s would render dead buttons).
Surgical reapply of the timeout portion of PR #45904; the unrelated
channel-context changes bundled in that PR were intentionally excluded.
Co-authored-by: cruzanstx <cruzanstx@users.noreply.github.com>
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