Teams tile: one Colors group, no Positions switches

Colors and Status colors were two groups asking the same question, so they
are one: team header, the tints and the three status colours together.

The Positions switches go entirely — the team switches already decide what
a tile shows, and "Group by position" still arranges what is left. With
them go GET /positions and positionOptions().

Two rules the tile was breaking on the way past: a gear group may carry no
`help` (rule 5), and only hide-toggles belong in Show (rule 8) — so the
group blurbs are gone and the Columns picker sits loose at the top beside
the team switches.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

modules/pco-plan/teams-client.js

@@ -94,12 +94,10 @@ export default function createTeams({ root, moduleApi }) {
   function visibleTeams() {
     const teams = Array.isArray(state?.teams) ? state.teams : [];
     const wantTeams = chosen('teams');
-    const wantPositions = chosen('positions');
     const out = [];
     for (const team of teams) {
       if (wantTeams && !wantTeams.includes(team.id)) continue;
       const members = team.members.filter((m) => {
-        if (wantPositions && !wantPositions.includes(m.position || '(no position)')) return false;
         if (m.status === 'declined' && !on('showDeclined')) return false;
         if (m.status === 'unconfirmed' && !on('showUnconfirmed')) return false;
         return true;