Let a bot take any colour

A bot's identity was one of seven hues, and the hue picked both its colour
and its stone shape. Now its colour is free and its stone is its own:

- `bots.color` holds any `#rrggbb`, `bots.stone` the flat-cut shape it's
  drawn on. `bots.hue` stays as the palette column they replaced, read only
  as a fallback; `src/scripts/move-bot-colour-to-owners.ts` backfills an
  install from it (safe to rerun).
- `src/utils/bot-color.ts` is the only place a colour is validated or
  resolved (`resolveBotColor`/`resolveBotStone` carry the old hue forward,
  `botColorNeedsPaperFace` flips the eyes to paper on a very dark body), and
  `src/utils/bot-stone-props.ts` gives every row its props, so a row saved
  before this still renders as it did.
- `BotStone` takes the colour as the body's SVG `fill`, the one documented
  exception to the token rule: an arbitrary hex has no token to point at.
  `UnreadDot` follows it.
- The picker keeps the palette tiles (still shape and colour together) and
  adds a native swatch and a hex field, so a custom colour keeps its stone.
  Same place as before: the header avatar's modal and Settings > Bots, for
  crew managers. The coordinator stays hue-less.
- A recolour reaches other open tabs through `pushBotUpdated`.

src/components/general/logo-icon.tsx

@@ -1,4 +1,5 @@
 import type { ComponentProps } from "react";
+import { BotHues } from "@/src/dict/bot-dict";
 import BotStone from "./bot-stone";
 
 type Props = {
@@ -13,7 +14,8 @@ type Props = {
 export default function LogoIcon({ icon_size = 40, img_props }: Props) {
     return (
         <BotStone
-            hue="ember"
+            color={BotHues[0].color}
+            stone={BotHues[0].value}
             size={icon_size}
             label="Logo Icon"
             className={img_props?.className}