Restructure Settings nav, modernize import page, dedup/genres UX polish

Settings is now one top-nav entry with Credentials and Jobs as sidebar
sub-pages (jobs moved from /jobs to /settings/jobs). Manual import page
replaces the bare file input and free-text filename field with a drag-drop
dropzone and a proper file-picker table. Genres page drops the "force"
checkbox for two explicit buttons (Preview / Fix genres now). Dedup's
"Scan now" runs both the file-naming and acoustic passes together, and the
table labels which pass caught each candidate instead of showing the raw
pass name. .btn-ghost gets a visible border so it reads as a real button
next to Delete/Danger actions instead of looking unaligned. Job names
throughout the UI are now human-readable instead of raw job_key strings.

Also includes the fpcalc exit-code fix from earlier (fingerprint index
was discarding valid fingerprints on files with a benign decode warning).

app/routers/jobs.py

@@ -8,7 +8,7 @@ from app.models import JobRun, ScheduledJob
 from app.security.deps import require_auth
 from app.services import scheduler_service
 
-router = APIRouter(prefix="/jobs", tags=["jobs"])
+router = APIRouter(prefix="/settings/jobs", tags=["jobs"])
 templates = Jinja2Templates(directory="app/templates")
 
 
@@ -38,6 +38,7 @@ def _job_list_context(db):
         maintenance_jobs.append(
             {
                 "job_key": job_key,
+                "label": scheduler_service.humanize_job_key(job_key),
                 "description": scheduler_service.MAINTENANCE_JOB_DESCRIPTIONS.get(job_key, ""),
                 "next_run": _format_next_run(next_run),
                 "enabled": enabled_by_key.get(job_key, True),
@@ -46,7 +47,11 @@ def _job_list_context(db):
     recent_runs = list(
         db.execute(select(JobRun).order_by(JobRun.started_at.desc()).limit(50)).scalars()
     )
-    return {"maintenance_jobs": maintenance_jobs, "recent_runs": recent_runs}
+    return {
+        "maintenance_jobs": maintenance_jobs,
+        "recent_runs": recent_runs,
+        "humanize_job_key": scheduler_service.humanize_job_key,
+    }
 
 
 @router.get("")
@@ -70,7 +75,7 @@ async def run_now(job_key: str, user: dict = Depends(require_auth)):
         await scheduler_service.trigger_now(scheduler, job_key)
     except ValueError as exc:
         raise HTTPException(404, str(exc))
-    return RedirectResponse(url="/jobs", status_code=303)
+    return RedirectResponse(url="/settings/jobs", status_code=303)
 
 
 @router.post("/{job_key:path}/toggle")
@@ -81,7 +86,7 @@ async def toggle_enabled(job_key: str, user: dict = Depends(require_auth), db=De
     row = db.execute(select(ScheduledJob).where(ScheduledJob.job_key == job_key)).scalar_one_or_none()
     currently_enabled = row.enabled if row else True
     scheduler_service.set_maintenance_enabled(scheduler, job_key, not currently_enabled)
-    return RedirectResponse(url="/jobs", status_code=303)
+    return RedirectResponse(url="/settings/jobs", status_code=303)
 
 
 @router.get("/runs/{run_id}/log", response_class=PlainTextResponse)