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/dedup.py

@@ -14,6 +14,17 @@ templates = Jinja2Templates(directory="app/templates")
 # path is still available in the title attribute on hover).
 _LIBRARY_PREFIX = str(settings.music_data_dir / "Library") + "/"
 
+# dedup-library.sh's four tag-based passes (numbered_sibling, case_insensitive,
+# normalized, cross_album_fuzzy) all match on filenames/tags; find-fuzzy-dupes.py's
+# one pass (fuzzy_audio) matches on acoustic fingerprint. The specific pass
+# name is an implementation detail -- the table just needs to say which of
+# the two matching methods caught it.
+_ACOUSTIC_PASS = "fuzzy_audio"
+
+
+def _pass_label(pass_name: str) -> str:
+    return "Acoustically Similar" if pass_name == _ACOUSTIC_PASS else "File Naming"
+
 
 def _display_path(path: str) -> str:
     return path[len(_LIBRARY_PREFIX):] if path.startswith(_LIBRARY_PREFIX) else path
@@ -23,6 +34,7 @@ def _to_row(c) -> dict:
     return {
         "id": c.id,
         "pass_name": c.pass_name,
+        "pass_label": _pass_label(c.pass_name),
         "keep_path": c.keep_path,
         "delete_path": c.delete_path,
         "keep_display": _display_path(c.keep_path),
@@ -42,13 +54,10 @@ async def dedup_index(request: Request, user: dict = Depends(require_auth)):
 
 @router.post("/scan")
 async def scan(user: dict = Depends(require_auth)):
-    await dedup_review_service.scan(triggered_by="manual")
-    return RedirectResponse(url="/dedup", status_code=303)
-
-
-@router.post("/scan-fuzzy")
-async def scan_fuzzy(user: dict = Depends(require_auth)):
-    await dedup_review_service.scan_fuzzy(triggered_by="manual")
+    # Runs both the file-naming and acoustic passes -- see
+    # dedup_review_service.scan_all(). The candidates table shows which
+    # pass caught each one instead of needing two separate buttons.
+    await dedup_review_service.scan_all(triggered_by="manual")
     return RedirectResponse(url="/dedup", status_code=303)