fix: show callsign in zone member picker and DMR ID in RGL member picker

[pskillen]

Problem

Member pickers on Zone edit and RX group list edit show too little identifying information. Operators cannot reliably tell which channel or talk group they are adding or reordering — especially when names are similar, export qualifiers differ, or multiple repeaters share a town name.

Zone edit — missing callsign

Route: /zones/:id/edit · Component: ZoneMemberPicker.tsx

Both Available and In zone lists render checkboxes with channel.name only:

<Checkbox label={ch.name} … />

Filters also search name only (placeholder="Search by name…").

Callsign (channel.callsign) is the primary on-air identifier for repeaters and is shown elsewhere (channel list callsign column, map popups via channelDisplayLabel). It must appear in the zone member picker.

Expected

• Each row shows callsign and name — e.g. GB7GL — Glasgow or callsign as primary with name dimmed secondary (match existing list/map conventions).
• Filter matches callsign or name.
• Empty callsign: fall back to name only (no stray separators).

Related (optional same PR)

Zone detail member table (zones/detail.tsx) also omits callsign — consider aligning for consistency.

RX group list edit — missing DMR ID and type in list column

Route: /rx-group-lists/:id/edit · Component: RxGroupListMemberPicker.tsx

MemberOption carries name only. Rows show the display name; Available adds a Talk group / Private badge, but neither column shows the DMR ID (TalkGroup.number / Contact.identifier).

The In list column is worse: name + timeslot select only — no type badge, no DMR ID.

Operators need the numeric ID to distinguish e.g. multiple regional talk groups with similar names, or a private contact vs group call with the same label.

Expected

• Available and In list rows show:
  • Name (existing)
  • DMR ID — TalkGroup.number or Contact.identifier (label e.g. "ID" or inline 2355)
  • Kind — talk group vs private call (badge or short label; reuse existing badge styling)
• Filter matches name or DMR ID.
• Unresolved / empty ID: show —.

Reference

Detail/report table RxGroupListMembersTable.tsx already shows Type and Timeslot — extend that pattern with an ID column there too if trivial, so edit and detail stay aligned.

Acceptance criteria

• Zone member picker shows callsign + name on both sides; filter searches both.
• RGL member picker shows DMR ID and kind on both Available and In list.
• RGL filter searches name and DMR ID.
• No vendor/radio assumptions — display-only change.
• Component tests or snapshot updates if existing picker tests cover labels.

Relates to

• #12 — zone CRUD
• #13 — TG/RGL/contact CRUD

Workflow note

Small UI fix — one PR, conventional commit(s). Branch from origin/main.