Improve Git History navigation and asynchronous UI safety

Add a History ref selector for HEAD, local branches, remote branches, and tags without requiring checkout. Reuse cached branch-model display strings to keep large ref lists efficient.
Make deferred main-thread callbacks lifetime-safe across ecode controllers and plugins. Initialize plugin dispatchers during UIReady and extend MainThreadLifetime to support delayed and tagged dispatch.
Fix expandable Git History rows, empty merge projections, and commit-description expansion. Display only the physical first line while collapsed and avoid duplicating it in the expanded body.
Add coverage for history ref handling and preserve stale-request guards during repository and revision changes.
Fix UIImageViewer dimension reporting for sprites by displaying the underlying texture dimensions.
The Git History interface remains a work in progress.

bin/assets/i18n/de.xml

@@ -1263,6 +1263,10 @@ Für sichtbare Änderung ecode neu starten.</string>
 	<string name="git_history_refresh">Aktualisieren</string>
 	<string name="git_history_load_older">Ältere Commits laden</string>
 	<string name="git_history_empty">Noch keine Commits</string>
+	<string name="git_history_no_additional_commits">Keine weiteren Commits</string>
 	<string name="git_history_error">Git-Verlauf konnte nicht geladen werden</string>
 	<string name="git_history_retry">Wiederholen</string>
+	<string name="git_local_branch">Lokal</string>
+	<string name="git_remote_branch">Remote</string>
+	<string name="git_tag">Tag</string>
 </resources>

bin/assets/i18n/en.xml

@@ -1248,6 +1248,10 @@ Restart ecode to see the changes.</string>
 	<string name="git_history_refresh">Refresh</string>
 	<string name="git_history_load_older">Load older commits</string>
 	<string name="git_history_empty">No commits yet</string>
+	<string name="git_history_no_additional_commits">No additional commits</string>
 	<string name="git_history_error">Could not load Git history</string>
 	<string name="git_history_retry">Retry</string>
+	<string name="git_local_branch">Local</string>
+	<string name="git_remote_branch">Remote</string>
+	<string name="git_tag">Tag</string>
 </resources>

bin/assets/i18n/fr.xml

@@ -1247,6 +1247,10 @@ Redémarrer ecode pour voir les changements.</string>
 	<string name="git_history_refresh">Actualiser</string>
 	<string name="git_history_load_older">Charger les commits précédents</string>
 	<string name="git_history_empty">Aucun commit pour le moment</string>
+	<string name="git_history_no_additional_commits">Aucun commit supplémentaire</string>
 	<string name="git_history_error">Impossible de charger l’historique Git</string>
 	<string name="git_history_retry">Réessayer</string>
+	<string name="git_local_branch">Locale</string>
+	<string name="git_remote_branch">Distante</string>
+	<string name="git_tag">Tag</string>
 </resources>

bin/assets/i18n/zh.xml

@@ -1052,6 +1052,10 @@ file in the directory tree.</string>
 	<string name="git_history_refresh">刷新</string>
 	<string name="git_history_load_older">加载更早的提交</string>
 	<string name="git_history_empty">尚无提交</string>
+	<string name="git_history_no_additional_commits">没有其他提交</string>
 	<string name="git_history_error">无法加载 Git 历史记录</string>
 	<string name="git_history_retry">重试</string>
+	<string name="git_local_branch">本地</string>
+	<string name="git_remote_branch">远程</string>
+	<string name="git_tag">标签</string>
 </resources>