feat(market): trend sparkline in all portfolio styles + inline chart/style pickers

Render the portfolio trend sparkline in every row style, each with a layout that features it:
- Table: a dedicated header-labelled TREND column (48dp rows), aligned across rows.
- Cards: a left-aligned info stack (icon + label / value+delta chip / DRGX) with a full-height sparkline filling the rest of the width (content-driven, so short groups give the chart more room).
- Spotlight: a big-value-over-a-full-width-chart-band hero tile (92dp).
Default sparkline interval is now MONTH (a real curve from the daily series, not the young minute buffer). Removed the per-row container accent line (redundant with the icon/sparkline colour) and the per-group shielded/transparent bar (private-by-default makes it near-always 100%, and dropped its now-dead SumPortfolioSplit helper). DPI-scale the sparkline stroke. Adds the "Trend" column string across 9 languages.

Relocated the Market controls out of a removed settings modal + gear: the chart line/candle picker now sits top-right of the chart (left of the trade button, candle-capable ranges only), and the Table/Cards/Spotlight picker sits left of Manage. Dropped the market fetch-prices toggle (still in the general Settings page).

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

src/config/settings.h

@@ -91,7 +91,8 @@ public:
         bool showValue = true;          // show the converted/fiat value on the card
         bool show24h = false;           // show the 24h % change (live-market bases only)
         bool showSparkline = false;     // show a price-trend sparkline (live-market bases only)
-        int sparklineInterval = 0;      // 0=minute 1=hour 2=day 3=week 4=month (resample of price history)
+        int sparklineInterval = 4;      // 0=minute 1=hour 2=day 3=week 4=month (default month: a real curve
+                                        // from the daily series, vs the young in-session minute buffer)
         // Per-wallet visibility: "" (shown in every wallet — legacy/global) or a wallet-identity
         // hash (shown only when that wallet is active). New entries are tagged with the current
         // wallet so a portfolio built for wallet A doesn't clutter wallet B.