perf: lazy-load pull request workspace (Closes #541)

src/frontend_bundle.py

@@ -13,7 +13,10 @@ import rjsmin
 
 SCRIPT_TAG = re.compile(r'^<script src="(static/[^"?]+\.js)"></script>$', re.MULTILINE)
 WORKER_RUNTIME_SOURCE = "static/background-issue-sync.js"
-FEATURE_SOURCES = {"issue-capture": ("static/create-issue-sheet.js",)}
+FEATURE_SOURCES = {
+    "issue-capture": ("static/create-issue-sheet.js",),
+    "pull-workflow": ("static/pull-sheet.js", "static/review-sheet.js"),
+}
 CACHE_DECLARATION = re.compile(
     r"const CACHE = 'stackchain-dashboard-shell-(?:v\d+|[0-9a-f]{16})';"
 )