Cross-season /stats page (#394)

[elfensky]

Summary

Phase A Part 1 of #178 — the cross-season /stats page. Sibling of #391 (Part 2, shipped in 0.48.0).

One new getCrossSeasonStats() query feeds every section: SQL GROUP BY aggregates over h1_event, h1_status, h1_season, and h1_statistic, plus a per-season war-outcome derivation that reuses getWarOutcome's algorithm on a slim per-season slice (final faction states + relevant events + a synthetic any-all-3-defeated snapshot flag). The query already returns telemetry fields, so the deferred telemetry components slot in cleanly later with no DB change.

Three components ship:

• Faction Threat Ranking — per-faction overall HD win rates across every war as a faction-colored Recharts horizontal bar chart, sorted ascending so the most-threatening enemy reads first.
• War Outcomes & Streaks — total wars, victories, defeats, win rate, longest win/loss streaks (with season ranges), plus a wrapping per-season outcome timeline of success/danger pills.
• All-Time Records — longest war, most events, longest average battle, most defends/attacks won; each card attributed to the season that owns the extremum.

HeaderNav and BottomNav gain a Stats entry between Archives and Docs.

Deferred

The three telemetry charts originally listed in #178 (Friendly Fire Index, Accuracy Trend, Shots per Planet) are deferred — h1_statistic currently exists only for season 157, so a "trend across seasons" would be a one-point chart. They become a small fast-follow once telemetry accumulates beyond season 157.

Test Plan

• npm run lint — clean
• npm run typecheck — clean
• npm run test:unit — 1365 passing across 123 files (18 new tests across the query, the three components, and the two nav entries; built test-first throughout)
• npm run build — succeeds; precache manifest grew 158 → 164 URLs to cover the new route
• DevTools verify — BLOCKED. Local dev server stopped responding to app routes (/, /archives, /stats all returning 4xx) midway through verification. Recommend restarting npm run dev and visiting /stats to confirm the three sections render and the Recharts bar chart paints, before merging. Will also be visible on staging once develop builds.

🤖 Generated with Claude Code

[elfensky]

DevTools verify ✅ — dev server restarted on :3001, /stats renders the full page:

• Nav: STATS entry active in HeaderNav ✓
• Faction Threat Ranking: Recharts bar chart paints, sorted ascending. Cyborgs (36% HD win rate) edge out as most-threatening, Bugs (38%) least. ✓
• War Outcomes & Streaks: 157 wars / 112 victories / 45 defeats / 71% win rate. Longest win streak = 73 wars across S19–S91; longest loss = 5 across S149–S153. 157 W/L pills wrap below. ✓
• All-Time Records: LONGEST_WAR S157 (1mo1w, ongoing) · MOST_EVENTS S153 (119) · LONGEST_AVG_BATTLE S24 (1d8h) · MOST_DEFENDS_WON S18 (29) · MOST_ATTACKS_WON S2 (4) ✓

Last gate cleared. Ready for review/merge.

[elfensky]

Tacked on a small archives-grid fix (e2e29a8) — ArchiveStats (the extras grid on /archives) was hard-capped at lg:grid-cols-3 so its 4th+ cards wrapped under the wider auto-fit hero grid above it. Swapped to the same .stat-grid class so both grids breathe with the viewport. Adjacent to the #394 work since both consume StatGrid directly. Tests + DevTools verified.