feat(market): line/candle toggle + ~50% taller chart

- Add a chart-style toggle (line vs candlestick) next to the interval buttons,
  shown only when the selected range has per-exchange candles (the aggregate /
  Live view is line-only). It flips s_mkt.chartStyle; candles draw when OHLC
  exists AND the user hasn't switched to the line. Icon reflects the current
  style; tooltip says what a click switches to. Two i18n keys across 8 languages.
- Make the price chart ~50% taller: scale the height floor / desired / viewport
  cap (110->165, x1.5 desired, 0.22->0.33 of available) for a roomier plot.

Verified via a forced-OHLC render: the taller chart, the toggle button, and
candles with a correct week/day x-axis.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

res/lang/ja.json

@@ -548,6 +548,8 @@
     "market_price_loading": "価格データを読み込み中...",
     "market_price_unavailable": "価格データが利用できません",
     "market_refresh_price": "価格データを更新",
+    "market_style_candle": "ローソク足に切り替え",
+    "market_style_line": "折れ線チャートに切り替え",
     "market_trade_on": "%s で取引",
     "market_updated": "\\xc2\\xb7 更新: %s",
     "market_vol_short": "出来高",