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

common/layout.py

@@ -276,9 +276,23 @@ def Page(
     scripts: SafeText | str = "",
     mastered: bool = False,
 ) -> SafeText:
-    """Assemble a full HTML document around `content` (the fast_app equivalent)."""
+    """Assemble a full HTML document around `content` (the fast_app equivalent).
+
+    Scripts are collected from `content`'s component tree: every component
+    declares its JS via `Media`, and `collect_media` gathers (deduped) the union
+    for the whole page. The `scripts` argument remains for page-specific glue
+    that isn't owned by a reusable component (e.g. the add-form helpers).
+    """
+    from common.components import ModuleScript, StaticScript, collect_media
     from games.views.general import global_current_year, model_counts
 
+    media = collect_media(content)
+    collected_scripts = "".join(
+        [str(ModuleScript(name)) for name in media.js]
+        + [str(StaticScript(name)) for name in media.js_external]
+    )
+    all_scripts = collected_scripts + (str(scripts) if scripts else "")
+
     counts = model_counts(request)
     year = global_current_year(request)["global_current_year"]
     navbar = Navbar(
@@ -328,7 +342,7 @@ def Page(
         f'            <div id="main-container" class="flex flex-1 flex-col pt-8 pb-16">{content}</div>\n'
         f'            <span class="fixed left-2 bottom-2 text-xs text-slate-300 dark:text-slate-600">{version()} ({version_date()})</span>\n'
         "        </div>\n"
-        f"        {scripts}\n"
+        f"        {all_scripts}\n"
         f"        {_main_script(mastered)}\n"
         "        <!-- hx-swap-oob makes sure the modal gets removed upon any HTMX response -->\n"
         '        <div id="global-modal-container" hx-swap-oob="true"></div>\n'