feat(element-tools): add 10 v1 tools with theme parameter (P3 batch 8)
Converts sidebar_nav, skeleton, social_login_row, spinner, stat_card,
stat_grid, status_badge, step_card, stepper, switch to theme-aware v1.
All 9 touchpoints wired; ext-8 shard extended for schema definitions.
ListTools count: 167 → 177. All 4116 tests pass.
Notable: spinner/stat_grid/status_badge/switch emit identical trees
across all theme modes (caller-param colors, status semantics, or iOS
HIG builder-private literals per spec §3.4) — theme param accepted
for API consistency only.
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