rm0 surface stats page in the dry-run plan

Review follow-up: collect_dry_run_plan stored plan["stats_page"] but
print_dry_run_plan never rendered it, so --dry-run gave no signal about
the STATS_PAGE toggle or the stats/camera pages generate() would write
(dead assignment, breaking parity with splash_page).

Print a "Stats page: <yes|no>" line and, when enabled, list stats.html
and camera-*.html under "Planned generated files" (camera pages are a
wildcard since dry-run does not run EXIF aggregation). Add a --dry-run
--no-stats test asserting the stats plan is omitted, and extend the
existing dry-run test to assert the stats lines when enabled.

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

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