feat: polish jump hop themed runtime assets

server-rs/crates/spacetime-module/src/jump_hop.rs

@@ -312,6 +312,7 @@ fn create_jump_hop_agent_session_tx(
         tile_assets: Vec::new(),
         path: None,
         cover_composite: None,
+        back_button_asset: None,
         generation_status: JUMP_HOP_GENERATION_DRAFT.to_string(),
     };
     ctx.db
@@ -391,6 +392,11 @@ fn compile_jump_hop_draft_tx(
             .unwrap_or_default(),
         path: Some(path.clone()),
         cover_composite: input.cover_composite.as_deref().and_then(clean_optional),
+        back_button_asset: input
+            .back_button_asset_json
+            .as_deref()
+            .map(parse_json)
+            .transpose()?,
         generation_status: input
             .generation_status
             .clone()
@@ -425,6 +431,7 @@ fn compile_jump_hop_draft_tx(
         path_json: to_json_string(&path),
         cover_image_src: draft.cover_composite.clone().unwrap_or_default(),
         cover_composite: draft.cover_composite.clone().unwrap_or_default(),
+        back_button_asset_json: draft.back_button_asset.as_ref().map(to_json_string),
         generation_status: draft.generation_status.clone(),
         publication_status: JUMP_HOP_PUBLICATION_DRAFT.to_string(),
         play_count: 0,
@@ -830,6 +837,12 @@ fn build_work_snapshot(row: &JumpHopWorkProfileRow) -> Result<JumpHopWorkSnapsho
         path,
         cover_image_src: row.cover_image_src.clone(),
         cover_composite: clean_optional(&row.cover_composite),
+        back_button_asset: row
+            .back_button_asset_json
+            .as_deref()
+            .and_then(clean_optional)
+            .map(|value| parse_json(&value))
+            .transpose()?,
         publication_status: row.publication_status.clone(),
         publish_ready: is_publish_ready(row),
         play_count: row.play_count,
@@ -889,6 +902,12 @@ fn sync_session_from_work_update(
         tile_assets: parse_json_or_default(&work.tile_assets_json),
         path: Some(parse_json(&work.path_json)?),
         cover_composite: clean_optional(&work.cover_composite),
+        back_button_asset: work
+            .back_button_asset_json
+            .as_deref()
+            .and_then(clean_optional)
+            .map(|value| parse_json(&value))
+            .transpose()?,
         generation_status: work.generation_status.clone(),
     };
 
@@ -1209,6 +1228,11 @@ fn is_publish_ready(row: &JumpHopWorkProfileRow) -> bool {
         && !row.tile_atlas_asset_json.trim().is_empty()
         && !row.tile_assets_json.trim().is_empty()
         && !row.path_json.trim().is_empty()
+        && row
+            .back_button_asset_json
+            .as_deref()
+            .and_then(clean_optional)
+            .is_some()
 }
 
 fn default_config_from_seed(seed_text: &str) -> JumpHopCreatorConfigSnapshot {
@@ -1399,6 +1423,7 @@ fn clone_work(row: &JumpHopWorkProfileRow) -> JumpHopWorkProfileRow {
         published_at: row.published_at,
         visible: row.visible,
         theme_text: row.theme_text.clone(),
+        back_button_asset_json: row.back_button_asset_json.clone(),
     }
 }
 

server-rs/crates/spacetime-module/src/jump_hop/tables.rs

@@ -59,6 +59,9 @@ pub struct JumpHopWorkProfileRow {
     // 跳一跳生成主题独立于作品标题；旧行按 work_title 兜底。
     #[default(None::<String>)]
     pub(crate) theme_text: Option<String>,
+    // 跳一跳左上角真实可点击返回按钮的独立透明资产快照；旧行为空时运行态使用样式兜底。
+    #[default(None::<String>)]
+    pub(crate) back_button_asset_json: Option<String>,
 }
 
 #[spacetimedb::table(

server-rs/crates/spacetime-module/src/jump_hop/types.rs

@@ -56,6 +56,7 @@ pub struct JumpHopDraftCompileInput {
     pub tile_atlas_asset_json: Option<String>,
     pub tile_assets_json: Option<String>,
     pub cover_composite: Option<String>,
+    pub back_button_asset_json: Option<String>,
     pub generation_status: Option<String>,
     pub compiled_at_micros: i64,
 }
@@ -248,6 +249,7 @@ pub struct JumpHopDraftSnapshot {
     pub tile_assets: Vec<JumpHopTileAssetSnapshot>,
     pub path: Option<module_jump_hop::JumpHopPath>,
     pub cover_composite: Option<String>,
+    pub back_button_asset: Option<JumpHopCharacterAssetSnapshot>,
     pub generation_status: String,
 }
 
@@ -291,6 +293,7 @@ pub struct JumpHopWorkSnapshot {
     pub path: module_jump_hop::JumpHopPath,
     pub cover_image_src: String,
     pub cover_composite: Option<String>,
+    pub back_button_asset: Option<JumpHopCharacterAssetSnapshot>,
     pub publication_status: String,
     pub publish_ready: bool,
     pub play_count: u32,

server-rs/crates/spacetime-module/src/migration.rs

@@ -1330,6 +1330,12 @@ fn normalize_migration_row(table_name: &str, value: &serde_json::Value) -> serde
             object
                 .entry("visible".to_string())
                 .or_insert_with(|| serde_json::Value::Bool(true));
+            if table_name == "jump_hop_work_profile" {
+                // 中文注释：跳一跳主题返回按钮资产晚于首版作品表加入，旧迁移包按未生成按钮兼容。
+                object
+                    .entry("back_button_asset_json".to_string())
+                    .or_insert(serde_json::Value::Null);
+            }
         }
     }
     if table_name == "match_3_d_work_profile" || table_name == "match3d_work_profile" {