feat(search): side preview panel for mirror search + strip stray NUL byte

Splits the palette into results (left) + a preview panel (right) that updates
on hover / arrow-key navigation, modern-search style. Since disabled-pack
nodes have no loaded definition (can't render a real node graphic), the panel
shows the pack metadata we do have: title, author, description, repo link,
version, and the sibling nodes in the pack (active node highlighted). Enable
7d / Enable available in both the row and the panel.

buildDisabledCatalog now attaches a shared per-pack meta object (from
getmappings entry[1]) to each catalog entry. Also removes a literal NUL byte
that had slipped into the dedup separator string, which made grep treat the
file as binary; replaced with a newline. Bump to 1.5.0.

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "comfyui-nodes-stats"
 description = "Track usage statistics for all ComfyUI nodes and packages"
-version = "1.4.1"
+version = "1.5.0"
 license = "MIT"
 
 [project.urls]