Adds a Table/Graph toggle to Fleet → Traffic. Graph mode draws the fleet
as a ReactFlow diagram with a second toggle that switches edge encoding
between Tunnels (one edge per node pair, coloured by tunnel state) and
Aliases (same edges labelled with alias counts). Clicking a node card
opens the existing opt-in sheet, where each opted-in stack now has a
Topology button that opens a focused side sheet showing the stack at
the centre, the aliases it publishes, and the meshed consumer nodes
with per-tunnel state.
Reuses the existing /mesh/status and /mesh/aliases endpoints; no
backend changes. Inherits the Admiral gate from the parent Routing
tab. Layout helpers and the per-stack sheet are unit-tested.
Anso
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