Include all :data page component deps in every page's client bundle

Per-page bundling now unions deps from all :data pages in the service,
so navigating between data pages uses client-side rendering + cache
instead of expensive server fetch + SX parse.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/sx/helpers.py

@@ -740,8 +740,9 @@ def sx_page(ctx: dict, page_sx: str, *,
     from .jinja_bridge import components_for_page, css_classes_for_page
     from .css_registry import lookup_rules, get_preamble, registry_loaded, store_css_hash
 
-    # Per-page component bundle: only definitions this page needs
-    component_defs, component_hash = components_for_page(page_sx)
+    # Per-page component bundle: this page's deps + all :data page deps
+    from quart import current_app as _ca
+    component_defs, component_hash = components_for_page(page_sx, service=_ca.name)
 
     # Check if client already has this version cached (via cookie)
     # In dev mode, always send full source so edits are visible immediately
@@ -755,7 +756,7 @@ def sx_page(ctx: dict, page_sx: str, *,
     sx_css_classes = ""
     sx_css_hash = ""
     if registry_loaded():
-        classes = css_classes_for_page(page_sx)
+        classes = css_classes_for_page(page_sx, service=_ca.name)
         # Always include body classes
         classes.update(["bg-stone-50", "text-stone-900"])
         rules = lookup_rules(classes)

shared/sx/jinja_bridge.py

@@ -332,17 +332,32 @@ def client_components_tag(*names: str) -> str:
     return f'<script type="text/sx" data-components>{source}</script>'
 
 
-def components_for_page(page_sx: str) -> tuple[str, str]:
+def components_for_page(page_sx: str, service: str | None = None) -> tuple[str, str]:
     """Return (component_defs_source, page_hash) for a page.
 
     Scans *page_sx* for component references, computes the transitive
     closure, and returns only the definitions needed for this page.
+
+    When *service* is given, also includes deps for all :data pages
+    in that service so the client can render them without a server
+    roundtrip on navigation.
+
     The hash is computed from the page-specific bundle for caching.
     """
     from .deps import components_needed
     from .parser import serialize
 
     needed = components_needed(page_sx, _COMPONENT_ENV)
+
+    # Include deps for all :data pages so the client can render them
+    if service:
+        from .pages import get_all_pages
+        for page_def in get_all_pages(service).values():
+            if page_def.data_expr is not None and page_def.content_expr is not None:
+                content_src = serialize(page_def.content_expr)
+                data_deps = components_needed(content_src, _COMPONENT_ENV)
+                needed |= data_deps
+
     if not needed:
         return "", ""
 
@@ -375,16 +390,24 @@ def components_for_page(page_sx: str) -> tuple[str, str]:
     return source, digest
 
 
-def css_classes_for_page(page_sx: str) -> set[str]:
+def css_classes_for_page(page_sx: str, service: str | None = None) -> set[str]:
     """Return CSS classes needed for a page's component bundle + page source.
 
     Instead of unioning ALL component CSS classes, only includes classes
-    from components the page actually uses.
+    from components the page actually uses (plus all :data page deps).
     """
     from .deps import components_needed
     from .css_registry import scan_classes_from_sx
+    from .parser import serialize
 
     needed = components_needed(page_sx, _COMPONENT_ENV)
+
+    if service:
+        from .pages import get_all_pages
+        for page_def in get_all_pages(service).values():
+            if page_def.data_expr is not None and page_def.content_expr is not None:
+                content_src = serialize(page_def.content_expr)
+                needed |= components_needed(content_src, _COMPONENT_ENV)
     classes: set[str] = set()
 
     for key, val in _COMPONENT_ENV.items():