Make daily movements visible on the line charts. The y-axis still spans
~£700k–£1M so an £8k daily move is ~1% of vertical range and easy to
miss when only the line is drawn.
Changes per panel:
* 5 (Net worth): showPoints never→always, pointSize 4→5, fillOpacity 20→10
* 6 (Net contrib vs market): showPoints never→always, pointSize 4→5
* 7 (Growth over time): showPoints never→always, pointSize 4→5, fillOpacity 50→25
* 8 (Per-account stacked): showPoints never→always (kept stacking fill at 70)
* 9 (Cash vs invested stacked): showPoints never→always (kept stacking fill at 70)
Each daily value now renders as a visible dot, so even if the line
appears flat at this scale, the per-day points trace the wiggle. Lighter
fill on the unstacked panels lets the line + points dominate visually.
Caveat: the fundamental "£8k on a £1M base" visibility issue is best
solved with a dedicated "Daily change" delta panel — happy to add one
on next pass if this isn't enough.
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