feat(control-plane): revamp bank stats view and modernize shared UI primitives

[nicoloboschi]

Summary

• Rework the bank stats tab into a dashboard-grade view: unified Memory-store card with composition + link types side-by-side, consolidation + mental-model staleness cards, modern palette, and a toggleable per-fact-type memories-ingested area chart with a 1h/12h/1d/7d/30d/90d period switcher.
• Modernize the shared Card and Table primitives (softer ring, dark-mode-aware shadow, rounded-xl, softer row borders) — every card and table in the app picks up the new look.
• Align the fact-type filter (used on the recall page) with the new chart palette so memory types look consistent across views.

Backend

• New endpoint GET /v1/default/banks/{bank_id}/stats/memories-timeseries?period=<1h|12h|1d|7d|30d|90d> returning a fully-padded bucket set broken down by fact type. Buckets are anchored on UTC boundaries (deterministic across deployments; matches client-side ISO keys for zero-fill). Response shape: MemoriesTimeseriesResponse { bank_id, period, trunc, buckets: [MemoryTimeseriesBucket] }.
• BankStatsResponse gains operations_by_status: dict[str, int].
• Both changes covered by tests/test_bank_stats.py (10 cases: all periods, empty-bank zero-fill, retained memories land in the right bucket, invalid period fallback, ops-status passthrough).

Client / UI

• OpenAPI + Python / TypeScript / Go SDKs regenerated.
• New control-plane proxy route /api/stats/[agentId]/memories-timeseries.
• bank-stats-view.tsx rewritten: unified card layout, palette driven by CSS vars (--primary / --chart-1..5 where appropriate, with brand hexes kept for link types to match the graph view), custom ChartTooltip, reusable Distribution + ProgressRow helpers, period & toggleable-series state.

Test plan

• Unit/integration: cd hindsight-api-slim && uv run pytest tests/test_bank_stats.py -v — 10 passing.
• Lint: ./scripts/hooks/lint.sh — passing.
• Manual UI: load a bank, confirm
  • Memory store card renders with composition + link types side by side
  • Period switcher refetches and chart shows continuous line with empty days as zeros
  • Toggling fact-type pills adds/removes the corresponding stacked area
  • Consolidation + Mental Models cards show progress bars (up-to-date vs stale)
  • Tables everywhere have the new soft-ring container with no doubled borders
  • Recall page fact-type filter uses the new violet/pink/indigo palette
  • Dark mode: cards, chart strokes, tooltips all visible (no more black strokes)