Dashboard detail, library filtering/pagination, simplified playlist times,

job descriptions

Dashboard: format breakdown (FLAC/MP3/etc. counts), approximate library
size (bitrate*length/8, same approximation `beet stats` itself uses --
verified to match its "100.5 GiB" output exactly against the real
library), and a credential auth-state summary per scope (configured y/n
plus, for Bandcamp, cookie expiry parsed locally from the stored cookie
jar -- deliberately not a live network probe like pipeline-status.sh's
Qobuz check, since this renders on every dashboard load).

Library: was one unfiltered page dumping all 4072 tracks. Added search
(artist/title/album), playlist and format filter dropdowns, and real
SQL-level pagination (LIMIT/OFFSET, not fetch-everything-then-slice).
beets_service gained count_items()/distinct_formats() to support this.

Playlists: cron_expr is still the stored/scheduled representation, but the
UI now shows and edits a plain daily time picker instead of raw cron
syntax -- every playlist schedule today is a simple daily HH:MM anyway.
playlist_service.cron_to_time()/time_to_cron() convert at the router
boundary; verified round-trip against all real playlist cron values.

Jobs: each maintenance job now shows a short one-line description of what
it actually does (MAINTENANCE_JOB_DESCRIPTIONS), and "next run" is
formatted consistently with playlists' time style (HH:MM, with a day
qualifier for non-today runs -- maintenance jobs can be weekly/monthly,
unlike playlists' plain daily schedule).

Verified end-to-end against the real production data (4072 tracks, 100.5
GiB, real credentials): stats/format-breakdown/search/pagination all
correct, all 7 credential scopes report configured with Bandcamp's real
cookie expiry (325 days), and a full authenticated page-render sweep
(dashboard, library with every filter combination, playlist detail,
jobs) all returned 200 with no template errors.

app/routers/jobs.py

@@ -12,6 +12,19 @@ router = APIRouter(prefix="/jobs", tags=["jobs"])
 templates = Jinja2Templates(directory="app/templates")
 
 
+def _format_next_run(dt) -> str:
+    """Same HH:MM (24h, zero-padded) convention the playlists' simplified
+    time field uses, with a short day qualifier when it's not today --
+    maintenance jobs can be weekly/monthly, so the date can't just be
+    dropped the way it is for playlists' plain daily time."""
+    if dt is None:
+        return "-"
+    now = dt.__class__.now(dt.tzinfo)
+    if dt.date() == now.date():
+        return dt.strftime("%H:%M")
+    return dt.strftime("%a %H:%M")
+
+
 def _job_list_context(db):
     scheduler = scheduler_service.get_scheduler()
     registered = {j.id: j for j in (scheduler.get_jobs() if scheduler else [])}
@@ -21,10 +34,12 @@ def _job_list_context(db):
     maintenance_jobs = []
     for job_key in scheduler_service.MAINTENANCE_JOBS:
         job = registered.get(job_key)
+        next_run = getattr(job, "next_run_time", None) if job else None
         maintenance_jobs.append(
             {
                 "job_key": job_key,
-                "next_run": getattr(job, "next_run_time", None) if job else None,
+                "description": scheduler_service.MAINTENANCE_JOB_DESCRIPTIONS.get(job_key, ""),
+                "next_run": _format_next_run(next_run),
                 "enabled": enabled_by_key.get(job_key, True),
             }
         )