feat(badges): give the badge colour pickers the full palette and a hex field

[kirillDevPro]

What & why

A user with 23 detect types could reach only nine usable swatches, two of them white, and the hex readout could not be typed into — so past nine badges there was no way to tell them apart by colour.

The cause was small: design::picker_palette() already offers 65 swatches and the chart and strategy pickers already pass it, but the Badges tab built its pickers without a palette and silently fell back to MoonUI's ten theme colours.

This wires it up, and makes the hex readout an input so a colour outside any palette is still reachable. Colours entered that way are remembered per theme and offered back at the front of the picker — which is what makes them usable across 23 badges rather than one.

How to verify

• cargo test --workspace — green (1300 + 255).
• Unit tests cover the hex parse/format round-trip and the custom-colour persistence, including that a shared-settings paste preserves the local custom-colour history.
• In the app: Settings → Badges, open any colour picker — 65 swatches; type a hex, press Enter, confirm it appears at the front of every row's picker and survives a restart.

Notes

• Depends on MoonUI #59, already merged. The lock moves the MoonUI pin to it; assert-only-moonui-moved holds — nothing else moved.
• BadgesConfig::parse_share gained a current argument so a pasted badge set cannot wipe the local custom-colour list; its one call site is updated.
• A real bug was caught during review on the MoonUI side and fixed there: custom_colors/set_custom_colors reversed the MRU order, so remembered colours came back oldest-first.
• Not verified visually: the hex field inside the popover and the scroll behaviour at 65+ swatches in both themes.