fix: nodes list UX, chat auto-poll, topnodes channel scoping, and timestamp fixes

[SimmerV]

Summary

• Stabilize nodes list scroll position during live 5s polling — freeze displayed items when scrolled away or a node is selected, with new-item count badge (closes Bug: Nodes list doesn't hold to one view when paused #419)
• Click outside the node list/details panel clears selection
• Deep link to a node (?node=xyz) auto-scrolls to and highlights the selected node
• Enable auto-polling for chat messages when live mode is active (closes Bug: Chat doesn't auto-poll #420)
• Scope /topnodes leaderboard to the mesh channel when run in a mapped Discord channel (closes Bug: discord bot /topnodes pulls combined results #423)
• Fix timestamps showing raw UTC/ISO on map details panel and traceroutes details — now formats to local time (closes Bug: lots of incorrect timestamps #422)
• Clamp future node clock timestamps on MQTT ingestion with warning log

Changes

Frontend

• NodesList.tsx — Frozen snapshot when paused/selected, displayItems via useMemo, new-item counter, "Back to top (N new)" button clears selection, native DOM scrollIntoView fallback for deep link scroll
• Nodes.tsx — Click-outside handler with refs, deep link scroll initialization, liveUiMode shows "paused" when node selected, scrollToId cleared on deselect
• useNodesSearchParams.ts — urlCh channel param support
• Chat.tsx — Added pollingInterval: 5000 with skipPollingIfUnfocused when live enabled
• map/detailsHtml.ts — Format last_seen to local time via toLocaleString() instead of raw ISO string
• TracerouteDetailsPanel.tsx — Removed raw .toISOString() UTC displays

Backend

• mqtt.py — Clamp rx_time to current time when node clock is >5 min ahead, log warning with node ID and drift
• bot/cogs/main_commands.py — /topnodes reverse-looks up Discord channel → mesh channel hash via bridge config, filters Chatterbox/Loudest Signal/Gateway MVP/Iron Man queries by channel; defer() moved to first line
• storage/db/postgres.py — query_top_nodes accepts optional channel_id filter for chat-based and node-based stats

[Copilot]

Pull request overview

This PR improves several live-update UX and data-scoping behaviors across the frontend, Discord bot, and ingestion pipeline, addressing multiple reported issues around list stability, chat polling, channel-specific leaderboards, and timestamp formatting.

Changes:

• Stabilizes the Nodes list during live polling (freeze-on-scroll/selection, deep-link scroll/highlight, click-outside deselect).
• Enables auto-polling on Chat when live mode is active.
• Scopes /topnodes results to a mapped mesh channel and fixes several timestamp display/ingestion issues (local formatting + clamp future rx_time).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
storage/db/postgres.py	Adds optional channel_id filter support to leaderboard queries (and scopes Iron Man by last_channel).
mqtt.py	Clamps future rx_time timestamps during MQTT ingestion with a warning log.
frontend/src/pages/traceroutes/TracerouteDetailsPanel.tsx	Removes raw UTC ISO timestamp rendering in favor of formatted timestamps.
frontend/src/pages/nodes/NodesList.tsx	Implements list-freezing, new-item counting, and improved deep-link scrolling via Virtuoso + DOM fallback.
frontend/src/pages/Nodes.tsx	Adds click-outside deselect + deep-link-only auto-scroll, and updates live-pill paused logic for selection.
frontend/src/pages/map/detailsHtml.ts	Formats “Last Seen” in node map details to local time instead of raw ISO/UTC.
frontend/src/pages/Chat.tsx	Adds RTK Query polling options tied to liveEnabled (interval + focus/reconnect behavior).
bot/cogs/main_commands.py	Scopes /topnodes to the mesh channel mapped from the Discord channel and adjusts embed title/footer accordingly.

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