stats: core-7 economy page with CPI index levels, rebase and categories

- /stats/economy defaults multi-country charts to CAN KOR CHN JPN USA NLD CUW,
  with add-a-country chips and an EU 27 comparison line
- CPI index levels rebased to a chosen base year, index/YoY toggle,
  categories (food, energy, housing, core) where the source has them
- new no-key collectors: oecd (CPI categories, 10y yields), statcan (CPI);
  bis WS_LONG_CPI, FRED US CPI categories, Eurostat prc_hicp_minr, WB FP.CPI.TOTL
- Canada added as a region; CBS Curacao fallbacks for growth/unemployment
- timers stats-oecd and stats-statcan

scripts/stats/common.ts

@@ -24,6 +24,7 @@ const hostGapMs: Record<string, number> = {
 	'fred.stlouisfed.org': 1000,
 	'ec.europa.eu': 500,
 	'stats.bis.org': 1000,
+	'www150.statcan.gc.ca': 1000,
 	'api.worldbank.org': 1000,
 	'www.imf.org': 1500,
 	'ourworldindata.org': 2000,
@@ -150,11 +151,28 @@ export const SOURCES = [
 	},
 	{
 		source_id: 'bis',
-		name: 'BIS central bank policy rates',
-		base_url: 'https://stats.bis.org/api/v2/data/dataflow/BIS/WS_CBPOL/1.0',
+		name: 'BIS (central bank policy rates, long consumer price series)',
+		base_url: 'https://stats.bis.org/api/v2/data/dataflow/BIS',
 		licence: 'Free reuse with attribution',
 		key_required: false,
-		attribution: 'Source: BIS, central bank policy rates (WS_CBPOL)'
+		attribution:
+			'Source: BIS, central bank policy rates (WS_CBPOL) and consumer prices (WS_LONG_CPI)'
+	},
+	{
+		source_id: 'oecd',
+		name: 'OECD Data Explorer (SDMX)',
+		base_url: 'https://sdmx.oecd.org/public/rest/data',
+		licence: 'CC BY 4.0',
+		key_required: false,
+		attribution: 'Source: OECD Data Explorer (prices; financial market statistics), CC BY 4.0'
+	},
+	{
+		source_id: 'statcan',
+		name: 'Statistics Canada (Web Data Service)',
+		base_url: 'https://www150.statcan.gc.ca/t1/wds/rest',
+		licence: 'Statistics Canada Open Licence',
+		key_required: false,
+		attribution: 'Source: Statistics Canada, table 18-10-0004-01 (Statistics Canada Open Licence)'
 	},
 	{
 		source_id: 'worldbank',
@@ -395,6 +413,7 @@ export const REGIONS: { region_code: string; name: string; kind: string; parent:
 		{ region_code: 'AUT', name: 'Austria', kind: 'country', parent: 'EU27' },
 		{ region_code: 'GBR', name: 'United Kingdom', kind: 'country', parent: 'WLD' },
 		{ region_code: 'JPN', name: 'Japan', kind: 'country', parent: 'WLD' },
+		{ region_code: 'CAN', name: 'Canada', kind: 'country', parent: 'WLD' },
 		{ region_code: 'IND', name: 'India', kind: 'country', parent: 'WLD' },
 		{ region_code: 'BRA', name: 'Brazil', kind: 'country', parent: 'WLD' },
 		{ region_code: 'RUS', name: 'Russia', kind: 'country', parent: 'WLD' },
@@ -415,6 +434,7 @@ export const COMPARE_ISO3 = [
 	'KOR',
 	'CHN',
 	'CUW',
+	'CAN',
 	'DEU',
 	'FRA',
 	'BEL',