Fix stats gauge bars rendering at width:0% (stats_category_max)

Regression from or0 (STATS_* accessors): stats_category_max compared
values via `(( _stats_counts_ref[key] > max ))`. For a nameref to an
ASSOCIATIVE array, an arithmetic subscript is itself arithmetic-evaluated,
so a string key (e.g. "sony") resolves to an unset variable -> 0, i.e. it
always read index 0 and returned max 0. Every bar then scaled to
width:0% (counts/percentages were unaffected, so only the bars looked
broken). Read the value through a quoted ${assoc[$key]} expansion first,
then compare.

The byte-identical double-render test missed this because both renders
were equally broken; added explicit non-zero bar-width assertions
(100% / 50%) to test_render_stats_page_renders_sections_and_escapes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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