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/pages/api/admin/bots/create-bot.ts

@@ -33,13 +33,13 @@ export const handler: BunextAPIRouteHandler<APIResponseObject<{ bot_id: number }
             throw new AppError(`This user can only read records.`);
         }
 
-        const { name, role, hue, system_prompt, workspace_id } = parseWithSchema({ schema: CreateBotRequestSchema, data: body });
+        const { name, role, color, stone, system_prompt, workspace_id } = parseWithSchema({ schema: CreateBotRequestSchema, data: body });
 
         if (workspace_id && !(await grabUserWorkspace({ workspace_id, user_id: user.id }))?.id) {
             throw new AppError(`Workspace not found.`);
         }
 
-        const bot_id = await createBot({ user_id: user.id, name, role, hue, system_prompt });
+        const bot_id = await createBot({ user_id: user.id, name, role, color, stone, system_prompt });
 
         if (workspace_id) {
             await addBotToWorkspace({ user_id: user.id, workspace_id, bot_id });

src/pages/api/admin/bots/update-bot.ts

@@ -13,8 +13,8 @@ import type {
 } from "@moduletrace/bunext/types";
 
 /**
- * Saves one of the session user's bots (name, job, hue, instructions).
- * Returns the bot.
+ * Saves one of the session user's bots (name, job, colour, stone,
+ * instructions). Returns the bot.
  */
 export const handler: BunextAPIRouteHandler<APIResponseObject<BUN_SQLITE_COBBLE_BOTS>> = async ({ req, body }) => {
     try {
@@ -32,12 +32,12 @@ export const handler: BunextAPIRouteHandler<APIResponseObject<BUN_SQLITE_COBBLE_
             throw new AppError(`This user can only read records.`);
         }
 
-        const { bot_id, name, role, hue, system_prompt } = parseWithSchema({
+        const { bot_id, name, role, color, stone, system_prompt } = parseWithSchema({
             schema: UpdateBotRequestSchema,
             data: body,
         });
 
-        const bot = await updateBot({ user_id: user.id, bot_id, name, role, hue, system_prompt });
+        const bot = await updateBot({ user_id: user.id, bot_id, name, role, color, stone, system_prompt });
 
         await logEvent({
             title: "Bot changed",