fix(imports): map Trakt season/episode items and normalize imported statuses

Trakt season/episode watchlist items now add the parent show instead of an
unrelated movie sharing the show's TMDB id; season/episode ratings are skipped
and reported as unsupported. The import processor normalizes statuses per
title type (TV never 'completed', movies never 'in_progress') and a data
migration repairs rows already stored wrongly.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

packages/core/test/import-parsers.test.ts

@@ -348,6 +348,34 @@ describe("parseTraktPayload", () => {
     expect(result.data.watchlist[0].type).toBe("tv");
   });
 
+  test("maps season and episode watchlist items to their show", () => {
+    const result = parseTraktPayload({
+      watchlist: [
+        { type: "season", show: { title: "Show S", ids: { tmdb: 10 } } },
+        { type: "episode", show: { title: "Show E", ids: { tmdb: 11 } } },
+      ],
+    });
+
+    expect(result.data.watchlist).toHaveLength(2);
+    expect(result.data.watchlist.map((w) => w.type)).toEqual(["tv", "tv"]);
+    expect(result.data.watchlist.map((w) => w.tmdbId)).toEqual([10, 11]);
+  });
+
+  test("skips season and episode ratings as unsupported", () => {
+    const result = parseTraktPayload({
+      ratings: [
+        { type: "episode", rating: 8, show: { title: "Show", ids: { tmdb: 12 } } },
+        { type: "season", rating: 6, show: { title: "Show", ids: { tmdb: 12 } } },
+        { type: "movie", rating: 10, movie: { title: "M", ids: { tmdb: 13 } } },
+      ],
+    });
+
+    expect(result.data.ratings).toHaveLength(1);
+    expect(result.data.ratings[0].type).toBe("movie");
+    expect(result.diagnostics?.unsupported).toBe(2);
+    expect(result.warnings.some((w) => w.includes("2 Trakt season/episode ratings"))).toBe(true);
+  });
+
   test("maps show rating type to tv", () => {
     const result = parseTraktPayload({
       ratings: [