Track gateway source, persist My Node banner, and update roles

[SimmerV]

Summary

• Track which node relayed/gated each node's packets into meshinfo via the MQTT sender field (Add node gateway source #96)
• Store gateway on the node model (in-memory and Postgres) — updated on every inbound message (neighborinfo, nodeinfo, position, telemetry)
• Add idempotent ALTER TABLE nodes ADD COLUMN IF NOT EXISTS gateway migration to ensure_schema() so existing databases auto-migrate on startup
• Display "Gateway" in the map detail panel with the gateway node's shortname, clickable to navigate to that node if it has a map position
• Display "Gateway" in the nodes page detail panel with the same clickable behavior
• Gateway field populates progressively as new MQTT messages arrive; existing nodes show it once they beacon after the update
• Cap map details panel height to prevent overlap with the legend/settings panel
• Replace ephemeral "My Node set to" toast with a persistent banner that stays visible while a My Node is active, with an X button to clear
• Update node roles to match current Meshtastic protobufs: rename ATAK → TAK, ATAK_TRACKER → TAK_TRACKER, add Router Late (11) and Client Base (12) (Add missing roles #367)
• Display full role titles (e.g. "Client Mute") instead of abbreviations ("CM") in the UI

[Copilot]

Pull request overview

This PR adds end-to-end “gateway/source” tracking for nodes (persisted server-side and displayed in the UI), updates role naming to match current Meshtastic protobufs, and improves map UI behavior (details panel height + persistent “My Node” indicator).

Changes:

• Persist and surface gateway (MQTT sender) on node updates, including an auto-migration for existing Postgres DBs.
• Update node roles (ATAK → TAK, add Router Late / Client Base) and adjust UI role display to show full titles.
• Improve map UX: cap details panel height and replace the transient “My Node set” toast with a persistent dismissible banner.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
storage/db/postgres.py	Adds gateway migration and persists gateway in node upserts and read models
postgres/sql/schema.sql	Adds gateway column to the canonical schema
mqtt.py	Captures MQTT sender into node.gateway across message handlers
models/node.py	Adds gateway to default node shape (partial)
frontend/src/types/index.ts	Adds gateway to node types; updates roles/titles
frontend/src/pages/nodes/nodesUtils.ts	Updates role labels to TAK + new roles
frontend/src/pages/nodes/NodeDetailsPanel.tsx	Displays Gateway field and enables clicking to select gateway node
frontend/src/pages/map/types.ts	Adds gateway to map node types
frontend/src/pages/map/detailsHtml.ts	Displays Gateway in the map details HTML (with optional click-to-select)
frontend/src/pages/map/MapDetailsPanel.tsx	Adjusts max height to avoid UI overlap
frontend/src/pages/graph/graphUtils.ts	Updates role colors/labels for new roles and TAK rename
frontend/src/pages/Nodes.tsx	Wires onSelectNode into NodeDetailsPanel usage
frontend/src/pages/Node.tsx	Updates role label mapping to TAK + new roles
frontend/src/pages/Map.tsx	Plumbs gateway into map node-like objects; adds persistent “My Node” banner
frontend/src/components/Role.tsx	Switches role display from abbreviation to full title

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