Stats UI: per-anime progress rows, status chips, on-hold, streak, detail line

- server: /api/stats top_anime rows enriched — poster, total eps, cur_ep,
  last_seen, status (finished/ongoing/hold heuristic), pace (ep/day),
  sub/dub watch-time split, rewatches (backward jump >60s); new on_hold
  + best_streak top-level keys; optional ?slug= filter (json_extract)
- frontend: 'Most watched' rows = poster + meta + status chip + completion
  bar (ongoing -> hold -> finished order); stat cards swap in on-hold and
  best streak, errors demoted to a one-liner; anime detail page gets a
  progress line (E12/24 · 4h 30m · 2.1 ep/day · status); history cards
  dim + label 'on hold' after 7 days; savePos now includes total eps
- css: .chip, .stat-anime rows, .card.hold, .detail-prog; drop dead .stat-row
- test: test_stats asserts the new fields + slug filter

tests/test_api.py

@@ -173,27 +173,42 @@ def test_stats(base=BASE):
     # fresh user: zeroed stats
     d = _json("GET", "/api/stats?days=7", jar=jar, base=base)
     assert d["watch_minutes"] == 0 and d["episodes"] == {"started": 0, "completed": 0}
-    # synthetic viewing: 3 position events an hour ago, pos deltas of 80s each
-    # (160s watched); one search
+    # synthetic viewing: ep 1 = 3 position events, pos deltas of 80s each
+    # (160s watched); ep 2 watched to 1190s of a 1200s dur (completed);
+    # one search. All an hour ago, jpn.
     c = sqlite3.connect(os.path.join(os.environ["ANIWEB_DATA"], "aniweb.db"))
     t0 = time.time() - 3600
-    e = {"slug_id": "stat-a", "ep_id": 900, "title": "Stat Show", "lang": "jpn",
-         "season_id": 1, "ep": "1", "dur": 1200}
+    e = {"slug_id": "stat-a", "title": "Stat Show", "lang": "jpn",
+         "season_id": 1, "dur": 1200, "total": 24, "poster": "https://p/1.jpg"}
     for i, pos in enumerate((0.0, 80.0, 160.0)):
         c.execute("INSERT INTO events (ts, user, type, payload) VALUES (?,?,?,?)",
-                  (t0 + 10 * i, "erin", "position", json.dumps({**e, "pos": pos, "t": t0 + 10 * i})))
+                  (t0 + 10 * i, "erin", "position",
+                   json.dumps({**e, "ep_id": 900, "ep": "1", "pos": pos, "t": t0 + 10 * i})))
+    for i, pos in enumerate((1100.0, 1190.0)):
+        c.execute("INSERT INTO events (ts, user, type, payload) VALUES (?,?,?,?)",
+                  (t0 + 30 + 10 * i, "erin", "position",
+                   json.dumps({**e, "ep_id": 901, "ep": "2", "pos": pos, "t": t0 + 30 + 10 * i})))
     c.execute("INSERT INTO events (ts, user, type, payload) VALUES (?,?,?,?)",
               (t0, "erin", "search", json.dumps({"q": "stat anime"})))
     c.commit()
     c.close()
     d = _json("GET", "/api/stats?days=7", jar=jar, base=base)
-    assert d["watch_minutes"] == 3, d  # round(160/60)
-    assert d["episodes"] == {"started": 1, "completed": 0}
-    assert d["days_active"] >= 1
-    assert sum(d["by_weekday"]) == 160  # seconds, Mon..Sun
-    assert d["top_anime"][0]["title"] == "Stat Show"
+    assert d["watch_minutes"] == 4, d  # round((160+90)/60)
+    assert d["episodes"] == {"started": 2, "completed": 1}
+    assert d["days_active"] == 1 and d["best_streak"] == 1
+    assert d["on_hold"] == 0
+    assert sum(d["by_weekday"]) == 250  # seconds, Mon..Sun
+    a0 = d["top_anime"][0]
+    assert a0["title"] == "Stat Show" and a0["status"] == "ongoing", a0
+    assert a0["cur_ep"] == "2" and a0["total"] == 24 and a0["poster"] == "https://p/1.jpg"
+    assert a0["sub"] == 250 and a0["dub"] == 0 and a0["pace"] == 2.0 and a0["rewatches"] == 0
     assert d["top_searches"] == ["stat anime"]
     assert d["sub_dub"]["jpn"] >= 1 and d["sub_dub"]["eng"] == 0
+    # slug filter scopes to one anime
+    ds = _json("GET", "/api/stats?days=7&slug=stat-a", jar=jar, base=base)
+    assert len(ds["top_anime"]) == 1 and ds["watch_minutes"] == 4
+    dn = _json("GET", "/api/stats?days=7&slug=none", jar=jar, base=base)
+    assert dn["top_anime"] == [] and dn["watch_minutes"] == 0
     # per-user isolation: alice never watched stat-a
     a = login("alice", "alicepw12345", base)
     da = _json("GET", "/api/stats?days=7", jar=a, base=base)