The quick-link panel is one WebContentsView outside `tabs`, so the
connector could not see a web app opened in the sidebar, and the
signed-in session there (Telegram's channel account, for one) was out of
reach. tabControl.list() now ends with the panel as tab 0 while it holds a
web page, tagged with the app's name; webContents, navigate, close and
activate handle it (activate reopens the panel, close closes it). It runs
the same preload as a web tab and still needs the site approved, so it
hands out nothing a tab doesn't. Listed last so it is never picked as the
active tab when a tool call omits tab_id.
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