Phase 4: Page() collects component media; drop manual scripts= threading

Page() now calls collect_media(content) and emits the ModuleScript /
StaticScript tags itself, so views no longer thread scripts= for
component-owned JS. The list views (game/session/purchase/device/
platform/playevent) compose with Fragment(filter_bar, content) instead of
mark_safe(str(filter_bar) + str(content)) — keeping the node tree intact
so the filter bar's media (filter_bar.js + search_select.js +
range_slider.js, and date_range_picker.js on purchases) reaches Page().
The stats views drop _STATS_SCRIPTS; YearPicker's datepicker.umd.js is
collected from its declared media.

The scripts= argument remains for page-specific glue not owned by a
component (the add-form helpers add_game.js / add_purchase.js /
add_session.js, alongside search_select.js for their form widgets).

Adds regression tests asserting the list and stats pages auto-load their
widget scripts with no scripts= in the view, and documents the node/
media model in CLAUDE.md.

https://claude.ai/code/session_01BKurBhE3Qj25p7Bfsg7EeK

games/views/device.py

@@ -2,9 +2,9 @@ from django.contrib.auth.decorators import login_required
 from django.http import HttpRequest, HttpResponse
 from django.shortcuts import get_object_or_404, redirect
 from django.urls import reverse
-from django.utils.safestring import mark_safe
 
 from common.components import (
+    Fragment,
     A,
     AddForm,
     Button,
@@ -12,7 +12,6 @@ from common.components import (
     Icon,
     paginated_table_content,
     DeviceFilterBar,
-    ModuleScript,
 )
 from common.layout import render_page
 from common.time import dateformat, local_strftime
@@ -76,14 +75,11 @@ def list_devices(request: HttpRequest) -> HttpResponse:
         preset_list_url=reverse("games:list_presets") + "?mode=devices",
         preset_save_url=reverse("games:save_preset") + "?mode=devices",
     )
-    content = mark_safe(str(filter_bar) + str(content))
+    content = Fragment(filter_bar, content)
     return render_page(
         request,
         content,
         title="Manage devices",
-        scripts=ModuleScript("range_slider.js")
-        + ModuleScript("search_select.js")
-        + ModuleScript("filter_bar.js"),
     )