* fix(sidebar): keep active New Chat visible before first message (#3408, @AJV20)
Squashed net diff of #3408. Injects ONLY the active ephemeral session into the
sidebar render rows (when the server list omits it) so a freshly-created New Chat
stays visible/selected before its first turn; inactive empty sessions stay
filtered as before. New Chat also resets a CLI source-filter back to webui so the
active chat isn't immediately hidden.
* fix(sidebar): gate active-row reinjection to 0-message ephemeral only (#3408 Codex follow-up)
Codex review found _ensureActiveSessionRowPresent re-injected ANY active session
after search-merge — so an active conversation WITH messages that was correctly
filtered out by the search query would pollute unrelated search results. Gate the
reinjection to Number(activeRow.message_count||0)<=0 so only the freshly-created
0-message ephemeral chat is re-added; an active chat with messages stays filtered
by search as before. Added a regression test asserting the gate.
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Co-authored-by: nesquena-hermes <[email protected]>
