The Backup status card sat with just a heading + tooltip on the right;
the Locations card on the same row already had a hint pill ("Active
destinations"). Mirror that pattern: show the next scheduled backup
time pushed to the right of the heading, so the user can see at a
glance when the daily run will fire without digging into Configuration.
Derived purely client-side from CFG_BACKUP_CRONTAB_APP (read off the
already-loaded window.systemConfigs map) — no backend surface needed:
- nextCronFireTime(expr) parses a 5-field crontab (minute hour dom
month dow) supporting *, N, lists (N,M,O), ranges (N-M), and
steps (* /N, N-M/S). Walks one minute at a time from now+1, honours
the POSIX OR rule for DOM+DOW, caps at 366 days so an unmatchable
expression doesn't loop forever, returns null on bad syntax so the
UI falls back gracefully.
- formatRelativeFuture(when) — formatRelative's future-tense sibling:
"in 6h", "tomorrow", "in 3d".
- formatScheduleClock(when) — "at 05:00" today, "Mon 05:00" otherwise.
Hint slot rendered in #backup-next-run. Three states:
- parseable + computable "Next backup tomorrow · at 05:00"
+ title with absolute time + schedule
- unparseable schedule "Schedule: <raw>" with title hint
- empty CFG_BACKUP_CRONTAB_APP "No schedule set" with title hint
Smoke-tested the cron parser against "0 5 * * *", "*/15 * * * *",
"30 23 * * 0", "0 0 1 * *", "", "garbage", and "0 5 * *" (4 fields).
Signed-off-by: librelad <librelad@digitalangels.vip>
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