stats: replace render_kind case with declare -F name dispatch

_stats_render_category dispatched on render_kind via a four-arm case
(camera|ranked|ordered|month), a modification magnet inconsistent with
the codebase's other data-driven dispatch (the STATS_RECORD_FUNCTIONS
registry and template.source.sh's prepare_template_render_var__<kind>
declare -F lookup).

Resolve the per-kind renderer by name instead: dispatch to
_stats_render_section__<render_kind> via `declare -F`, guarded so a
missing handler fails loudly (and so set -euo pipefail's errexit does
not trip on declare -F's non-zero "absent" status). Rename the three
section renderers to the _stats_render_section__{ranked,ordered,month}
convention.

Fold the camera kind into ranked: the camera leaderboard differed from
an ordinary ranked section only by the extra 'stats-leaderboard' <ul>
class -- data, not logic -- so it becomes a 'ranked' entry carrying that
class in a new optional 5th spec field (list_class), eliminating the
camera special case. Stats body output is byte-identical before/after
for every render kind (verified via snapshot diff); the existing stats
tests stay green.

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

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