feat: import Trading Economics HTML calendar — 993 events with forecasts

Adds a one-click upload+parse flow for the TE calendar page HTML.
The TE page (tradingeconomics.com/calendar) contains ~1000 events with
actuals, previous, and analyst consensus (forecast) values.

- Add backend/services/te_html_parser.py:
  - parse_html(html): extracts events from <tr data-event> rows
  - Maps 14 countries to major currencies (all Eurozone → EUR)
  - Impact inferred from data-category (high/medium/low)
  - Times converted from Europe/Zurich (CET/CEST) → UTC via zoneinfo
  - Actual=td[5], Forecast=td[7] (analyst consensus), Previous=td[6]
- Add POST /api/eco/te-html-upload (saves file to /tmp)
- Add POST /api/eco/te-html-import + GET /status (background parse)
- Add "Import TE HTML" upload button in CalendarPage ImportPanel

Tested locally: 993 events parsed, 854 with forecast, 861 with actual,
date range 2025-03-31 → 2026-06-17, timezone conversion verified.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/CalendarPage.tsx

@@ -1,6 +1,6 @@
-import { useState, useEffect, useCallback, useRef, KeyboardEvent } from 'react'
+import { useState, useEffect, useCallback, useRef, KeyboardEvent, useId } from 'react'
 import clsx from 'clsx'
-import { RefreshCw, ChevronDown, AlertTriangle, Check, Key } from 'lucide-react'
+import { RefreshCw, ChevronDown, AlertTriangle, Check, Key, Upload } from 'lucide-react'
 
 const API = ''
 
@@ -190,6 +190,38 @@ function ImportPanel({ stats, onImported }: { stats: FFStats; onImported: () =>
     } catch { setFxsSyncing(false); setFxsMsg('FXStreet error') }
   }
 
+  // TE HTML upload + import
+  const [teHtmlMsg, setTeHtmlMsg]       = useState<string | null>(null)
+  const [teHtmlBusy, setTeHtmlBusy]     = useState(false)
+  const teHtmlPollRef = useRef<ReturnType<typeof setInterval> | null>(null)
+  const fileInputId = useId()
+
+  const uploadAndImportTeHtml = async (file: File) => {
+    setTeHtmlBusy(true)
+    setTeHtmlMsg('uploading…')
+    try {
+      const form = new FormData()
+      form.append('file', file)
+      const up = await fetch(`${API}/api/eco/te-html-upload`, { method: 'POST', body: form }).then(x => x.json())
+      if (up.error) { setTeHtmlMsg(`Upload error: ${up.error}`); setTeHtmlBusy(false); return }
+      setTeHtmlMsg(`uploaded (${up.size_mb} MB) — importing…`)
+      await fetch(`${API}/api/eco/te-html-import`, { method: 'POST' })
+      teHtmlPollRef.current = setInterval(async () => {
+        const s = await fetch(`${API}/api/eco/te-html-import/status`).then(x => x.json())
+        if (!s.running) {
+          clearInterval(teHtmlPollRef.current!)
+          setTeHtmlBusy(false)
+          const r = s.last_result || {}
+          if (r.error) { setTeHtmlMsg(`Error: ${r.error}`); return }
+          setTeHtmlMsg(`✓ TE HTML: ${r.total} events (${r.date_from} → ${r.date_to})`)
+          onImported()
+        }
+      }, 2000)
+    } catch { setTeHtmlBusy(false); setTeHtmlMsg('error') }
+  }
+
+  useEffect(() => () => { if (teHtmlPollRef.current) clearInterval(teHtmlPollRef.current) }, [])
+
   const hasData = stats.total > 0
   const res = importStatus.last_result
 
@@ -228,6 +260,29 @@ function ImportPanel({ stats, onImported }: { stats: FFStats; onImported: () =>
         Sync Upcoming (FXStreet)
       </button>
 
+      {/* TE HTML import — paste calendar_data.txt from tradingeconomics.com */}
+      <label
+        htmlFor={fileInputId}
+        className={clsx(
+          'px-3 py-1.5 rounded flex items-center gap-1.5 text-white cursor-pointer',
+          teHtmlBusy
+            ? 'bg-amber-800 opacity-50 cursor-not-allowed'
+            : 'bg-amber-700 hover:bg-amber-600'
+        )}
+        title="Import Trading Economics HTML page (calendar_data.txt) — 1000 events with forecasts"
+      >
+        <Upload size={13} />
+        Import TE HTML
+      </label>
+      <input
+        id={fileInputId}
+        type="file"
+        accept=".txt,.html"
+        className="hidden"
+        disabled={teHtmlBusy}
+        onChange={e => { const f = e.target.files?.[0]; if (f) uploadAndImportTeHtml(f); e.target.value = '' }}
+      />
+
       {res && !importStatus.running && (
         res.error
           ? <span className="text-red-400 text-xs">Import error: {res.error}</span>
@@ -239,6 +294,11 @@ function ImportPanel({ stats, onImported }: { stats: FFStats; onImported: () =>
           {fxsMsg}
         </span>
       )}
+      {teHtmlMsg && (
+        <span className={clsx('text-xs', teHtmlMsg.startsWith('✓') ? 'text-emerald-400' : teHtmlMsg.startsWith('Error') ? 'text-red-400' : 'text-yellow-400')}>
+          {teHtmlMsg}
+        </span>
+      )}
     </div>
   )
 }