ensureGatewayProfile narrows the Sessions sidebar to the activated
profile as a side effect, so every cross-profile open from a plugin
surface silently locked the user into that profile's session list. A
plugin-driven open is a navigation, not a scope choice: openSession now
restores the unified all-profiles view after a cross-profile activation
(keepAllProfilesScope, default true; pass false for the old narrowing).
Same-profile opens write no scope at all.
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