fix: inline missing helper functions in chart HTML template

`lp_chart_core.ts` generates a self-contained HTML page with inline JS.
The template referenced `roundTo`, `fixedTo`, and `roundToDecimals` from
`math_utils` but never inlined them via `.toString()`, causing
`ReferenceError` in the browser — rendered the chart as a blank page.

## Fix
Added `.toString()` inlining for all three functions after
`padRange.toString()`, matching the pattern already used for
`escapeHtml`, `formatPct`, and `padRange`.

## Testing Notes
- Verified generated HTML now contains all three function definitions
- Chart renders correctly at http://localhost:8080/.../OPTIMIZED_AMA.html

Author: froooze

market_adapter/lp_chart_core.ts

@@ -291,6 +291,12 @@ ${formatPct.toString()}
 
 ${padRange.toString()}
 
+${roundTo.toString()}
+
+${fixedTo.toString()}
+
+${roundToDecimals.toString()}
+
 function formatCompactNumber(v) {
     const num = Number(v);
     if (!Number.isFinite(num)) return 'n/a';