refactor: extract view-model mappers from presentation handlers

Move mapping logic (domain→DTO/template structs) into mappers/ module.
Handlers now call mapper fns instead of inline conversions.

crates/presentation/src/mappers/movies.rs

@@ -0,0 +1,48 @@
+use api_types::{DiaryEntryDto, MovieDto, ReviewDto};
+use domain::models::{DiaryEntry, Movie, MovieSummary, Review};
+
+pub fn movie_to_dto(movie: &Movie) -> MovieDto {
+    MovieDto {
+        id: movie.id().value(),
+        title: movie.title().value().to_string(),
+        release_year: movie.release_year().value(),
+        director: movie.director().map(|d| d.to_string()),
+        poster_path: movie.poster_path().map(|p| p.value().to_string()),
+        genres: vec![],
+        runtime_minutes: None,
+        original_language: None,
+        overview: None,
+        collection_name: None,
+    }
+}
+
+pub fn summary_to_dto(summary: &MovieSummary) -> MovieDto {
+    MovieDto {
+        id: summary.movie.id().value(),
+        title: summary.movie.title().value().to_string(),
+        release_year: summary.movie.release_year().value(),
+        director: summary.movie.director().map(|d| d.to_string()),
+        poster_path: summary.movie.poster_path().map(|p| p.value().to_string()),
+        genres: summary.genres.clone(),
+        runtime_minutes: summary.runtime_minutes,
+        original_language: summary.original_language.clone(),
+        overview: summary.overview.clone(),
+        collection_name: summary.collection_name.clone(),
+    }
+}
+
+pub fn review_to_dto(review: &Review) -> ReviewDto {
+    ReviewDto {
+        id: review.id().value(),
+        rating: review.rating().value(),
+        comment: review.comment().map(|c| c.value().to_string()),
+        watched_at: review.watched_at().to_string(),
+    }
+}
+
+pub fn entry_to_dto(entry: &DiaryEntry) -> DiaryEntryDto {
+    DiaryEntryDto {
+        movie: movie_to_dto(entry.movie()),
+        review: review_to_dto(entry.review()),
+    }
+}