feat(cron): support persistent session targets for cron jobs (#9765)
Add support for `sessionTarget: "current"` and `session:<id>` so cron jobs can
bind to the creating session or a persistent named session instead of only
`main` or ephemeral `isolated` sessions.
Also:
- preserve custom session targets across reloads and restarts
- update gateway validation and normalization for the new target forms
- add cron coverage for current/custom session targets and fallback behavior
- fix merged CI regressions in Discord and diffs tests
- add a changelog entry for the new cron session behavior
Co-authored-by: kkhomej33-netizen <kkhomej33-netizen@users.noreply.github.com>
Co-authored-by: ImLukeF <92253590+ImLukeF@users.noreply.github.com>
- Updated isolated cron jobs to support new delivery modes: `announce` and `none`, improving output management.
- Refactored job configuration to remove legacy fields and streamline delivery settings.
- Enhanced the `CronJobEditor` UI to reflect changes in delivery options, including a new segmented control for delivery mode selection.
- Updated documentation to clarify the new delivery configurations and their implications for job execution.
- Improved tests to validate the new delivery behavior and ensure backward compatibility with legacy settings.
This update provides users with greater flexibility in managing how isolated jobs deliver their outputs, enhancing overall usability and clarity in job configurations.
