feat: all-video media row, clickable media selector, download button

- Backend: Add GET /api/games/{id}/download endpoint (ZIP streaming)
- Frontend: All videos now shown in media row alongside screenshots
- Click any media thumbnail to load it into the media container
- Videos show YouTube thumbnail, screenshots show image preview
- Active thumbnail has green border highlight
- Download button between Edit and Delete triggers ZIP download
- Early return: if no media, the entire section is hidden

src/main/java/com/dostalgia/GameResource.java

@@ -4,8 +4,13 @@ import jakarta.inject.Inject;
 import jakarta.ws.rs.*;
 import jakarta.ws.rs.core.MediaType;
 import jakarta.ws.rs.core.Response;
+import jakarta.ws.rs.core.StreamingOutput;
 import java.nio.file.NoSuchFileException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.*;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
 
 @Path("/api/games")
 @Produces(MediaType.APPLICATION_JSON)
@@ -90,6 +95,56 @@ public class GameResource {
         }
     }
 
+    @GET
+    @Path("/{id}/download")
+    @Produces("application/zip")
+    public Response download(@PathParam("id") String id) {
+        try {
+            var game = svc.load(id);
+            String filename = (game.getTitle() != null ? game.getTitle() : id) + ".zip";
+
+            if ("sockdrive".equals(game.getBundleType())) {
+                // ZIP all game files on the fly, excluding metadata
+                StreamingOutput stream = output -> {
+                    Path gameDir = svc.gameDir(id);
+                    try (var zos = new ZipOutputStream(output)) {
+                        Files.walk(gameDir)
+                            .filter(Files::isRegularFile)
+                            .filter(p -> !p.getFileName().toString().equals("game.json"))
+                            .filter(p -> !p.getFileName().toString().startsWith("cover."))
+                            .forEach(p -> {
+                                try {
+                                    String entryName = gameDir.relativize(p).toString().replace('\\', '/');
+                                    zos.putNextEntry(new ZipEntry(entryName));
+                                    Files.copy(p, zos);
+                                    zos.closeEntry();
+                                } catch (Exception e) {
+                                    throw new RuntimeException(e);
+                                }
+                            });
+                    }
+                };
+                return Response.ok(stream)
+                    .header("Content-Disposition", "attachment; filename=\"" + filename + "\"")
+                    .build();
+            } else {
+                // Standard .jsdos bundle
+                Path bundlePath = svc.getGamesDir().resolve(game.getBundleFile());
+                if (!Files.exists(bundlePath)) {
+                    return Response.status(404).entity(Map.of("error", "Bundle file not found")).build();
+                }
+                StreamingOutput stream = output -> Files.copy(bundlePath, output);
+                return Response.ok(stream)
+                    .header("Content-Disposition", "attachment; filename=\"" + filename + "\"")
+                    .build();
+            }
+        } catch (NoSuchFileException e) {
+            return Response.status(404).entity(Map.of("error", "Game not found")).build();
+        } catch (Exception e) {
+            return Response.serverError().entity(Map.of("error", e.getMessage())).build();
+        }
+    }
+
     @DELETE
     @Path("/{id}")
     public Response delete(@PathParam("id") String id) {