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/handlers/import.rs

@@ -24,12 +24,12 @@ use application::import::{
 };
 use domain::models::{
     AnnotatedRow, FieldMapping, FileFormat,
-    import::{DomainField, RowResult, Transform},
+    import::{DomainField, Transform},
 };
 use domain::value_objects::ImportSessionId;
 use template_askama::{
     ImportMappingTemplate, ImportPreviewRow, ImportPreviewTemplate, ImportProfileView,
-    ImportRowStatus, ImportUploadTemplate,
+    ImportUploadTemplate,
 };
 
 use crate::{
@@ -98,34 +98,7 @@ fn parse_mapping_form(form: &HashMap<String, String>) -> Vec<FieldMapping> {
     mappings
 }
 
-fn annotated_to_preview_row(idx: usize, annotated: &AnnotatedRow) -> ImportPreviewRow {
-    match &annotated.result {
-        RowResult::Valid(row) => {
-            let cells = vec![
-                row.title.clone().unwrap_or_default(),
-                row.release_year.clone().unwrap_or_default(),
-                row.director.clone().unwrap_or_default(),
-                row.rating.clone().unwrap_or_default(),
-                row.watched_at.clone().unwrap_or_default(),
-                row.comment.clone().unwrap_or_default(),
-            ];
-            ImportPreviewRow {
-                index: idx,
-                status: if annotated.is_duplicate {
-                    ImportRowStatus::Duplicate
-                } else {
-                    ImportRowStatus::Valid
-                },
-                cells,
-            }
-        }
-        RowResult::Invalid { errors, raw } => ImportPreviewRow {
-            index: idx,
-            status: ImportRowStatus::Invalid(errors.join("; ")),
-            cells: raw.iter().map(|(_, v)| v.clone()).collect(),
-        },
-    }
-}
+use crate::mappers::import::annotated_to_preview_row;
 
 // ── HTML wizard handlers ───────────────────────────────────────────────────