Economics page (v2 — international via DBnomics)

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User Story: As a global macro investor, I want the same economics page to surface ECB, Bank of England, Bundesbank, Banque de France, OECD, IMF, and World Bank indicators alongside the US series, so I can think about non-US monetary policy and cross-country comparisons.
Acceptance Criteria:

• Catalog gains a country pivot (US default, switch to EU / UK / DE / FR / JP / G7).
• Curated set extends to: ECB main refi rate, Eurozone HICP, BoE bank rate, UK CPI, Bundesbank yields, IFO sentiment, INSEE business confidence, OECD CLI, IMF WEO indicators.
• Calendar tab adds non-US release events (FMP economic calendar already covers most majors — verify coverage gap first).

Technical Notes:

• New internal/dbnomics/ client wrapping https://api.db.nomics.world/v22/series/{provider}/{dataset}/{code}?observations=1. Covers FED, BEA, BLS, ECB, BOE, BUBA, BDF, INSEE, DESTATIS, OECD, IMF, WB, EUROSTAT.
• Note: FRED itself is no longer hosted on DBnomics (provider removed) — that's why v1 uses FRED direct. DBnomics is purely for international expansion.
• Each provider has its own series ID convention — catalog needs a (provider, dataset, series_code) tuple per entry. Hand-curate the international additions; don't try to expose the full 1.7B-series DBnomics universe.
• Stretch: ECWB-style transforms (YoY, MoM, MA, lead/lag, log) as keystrokes on a charted economic series.

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Vertical slice up in #83 — ECB live with 6 series. UK / DE / JP / OECD CLI to follow in separate PRs after this lands.

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Phase B research notes (from feat/economics-vim-117 split)

Scoped this off the vim-nav PR because verifying DBnomics paths for the international additions is real work — the issue's "wrap provider/dataset/code" framing under-counts the per-provider series-code complexity. Findings from probing the public API:

Verified providers (DBnomics has them):

• BUBA (Bundesbank), INSEE (France), OECD, IMF, DESTATIS, ECB, BOE, ONS ✅
• IFO Institut is not a direct DBnomics provider — IFO data shows up under other providers (e.g. OECD business tendency surveys) ⚠️

Verified datasets:

• Bundesbank yields → BUBA/BBSIS — "Yields, term structure and securities issues statistics"
• INSEE business climate → INSEE/CLIMAT-AFFAIRES — "Business climate composite indicators"
• OECD CLI → OECD/DSD_STES@DF_CLI — "Composite leading indicators" (411 series)

Blocker: the actual series-code structure inside each dataset is multi-dimensional and varies per provider:

• ECB uses dotted codes like D.U2.EUR.4F.KR.MRR_FR.LEV (frequency.area.curr.something…)
• BUBA hints at BBK_SEIS_SECURITY_CLASS dimension with codes like A630 for "Federal Bonds (10-years Bunds)" but the full series-code shape needs the dataset's dimension page
• OECD's DSD_STES@DF_CLI uses [REF_AREA].[FREQ].[MEASURE]… (e.g. DEU.M.LI…) — the @ in the dataset code is unusual and may need URL-encoding via the client

Suggested follow-up scope (split #81 into smaller, verifiable issues):

• #81a — DBnomics: Bundesbank Bund yields (DE) — pick 2y, 5y, 10y Bund from BUBA/BBSIS with verified series codes
• #81b — DBnomics: INSEE business climate (FR) — CLIMAT-AFFAIRES headline + employment with verified codes
• #81c — DBnomics: OECD CLI (cross-country) — confirm DSD_STES@DF_CLI works through our client (URL encoding question on @); add CLI for OECD total + USA/DEU/GBR/FRA/JPN
• #81d — IMF WEO indicators — separate; annual freq, lower urgency for day-trading flow
• #81e — Catalog country pivot UI — chip row above central-bank tiles to filter by ISO-2 country; doesn't need new data
• #81f — Calendar non-US coverage audit — curl /api/economics/calendar, log which countries show up; document gap if any

Each of those is small enough to verify each path against the actual DBnomics API before merging — much safer than landing a batch with broken series codes.