fix(resolver): read NaN as null in the scan's legacy-parser fallback

ComfyUI stamps "is_changed": [NaN] on nodes that always re-run, the
PromptManager node among them. The legacy gallery and admin pages replaced
NaN with null before JSON.parse, so they traced these files' prompts. The
scan's fallback parsed records strictly, so every NaN-stamped file the
resolver could not decide (hires-fix and refiner chains, custom latent
nodes) fell to "Needs review" although legacy linked its prompt.

parse_page_json parses as the legacy pages did, but only the NaN number
reads as null: the word inside prompt text is kept. Infinity still makes
the record unreadable, as it did in the pages.

py/api/admin.py

@@ -41,7 +41,7 @@ try:
         PLACEHOLDERS,
         GenerationParamsError,
         extract_generation_params,
-        parse_js_json,
+        parse_page_json,
     )
     from ...utils.prompt_pair_resolver import resolve_prompt_pair
 except ImportError:
@@ -51,7 +51,7 @@ except ImportError:
         PLACEHOLDERS,
         GenerationParamsError,
         extract_generation_params,
-        parse_js_json,
+        parse_page_json,
     )
     from utils.prompt_pair_resolver import resolve_prompt_pair
 
@@ -1602,11 +1602,14 @@ class AdminRoutesMixin:
 
     @staticmethod
     def _graph_prompt_text(metadata):
-        """The positive prompt the browser parser traces from the graphs, or None."""
+        """The positive prompt the browser parser traces from the graphs, or None.
+
+        Records parse as the legacy pages parsed them (NaN reads as null).
+        """
         records = {}
         for key in ("prompt", "workflow"):
             value = metadata.get(key)
-            records[key] = parse_js_json(value) if isinstance(value, str) else value
+            records[key] = parse_page_json(value) if isinstance(value, str) else value
         try:
             positive = extract_generation_params(records)["positivePrompt"]
         except GenerationParamsError: