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/functions/backend/db/access/grab-crew-options.ts

@@ -8,7 +8,7 @@ import type { BUN_SQLITE_COBBLE_BOTS, BUN_SQLITE_COBBLE_WORKSPACES } from "@/db/
 export default async function grabCrewOptions() {
     const [bots, workspaces] = await Promise.all([
         BunSQLite.sql<BUN_SQLITE_COBBLE_BOTS>({
-            sql: `SELECT id, name, role, hue, image_media_id FROM bots WHERE kind = 'worker' ORDER BY name COLLATE NOCASE ASC, id ASC`,
+            sql: `SELECT id, name, role, color, stone, hue, image_media_id FROM bots WHERE kind = 'worker' ORDER BY name COLLATE NOCASE ASC, id ASC`,
         }),
         BunSQLite.sql<BUN_SQLITE_COBBLE_WORKSPACES>({
             sql: `SELECT id, name, description, image_media_id FROM workspaces WHERE archived = 0 ORDER BY name COLLATE NOCASE ASC, id ASC`,