A browser tab reads as a tab

Improved

• A browser chip now reads the tab's name — the same Title — host text the picker row shows — with the globe icon, instead of printing the machine handle @browser:tab/3. The handle moves to the chip's detail line, exactly as @terminal:13 already did.
• The + menu's Web group lists the open tabs. It was showing the @browser and @web: entries and nothing else, because the tab list reached the composer card and stopped there; the @ popover worked only because it is built where the tabs are in scope.

Fixed

• A browser chip no longer renders as a generic file chip. It has its own kind, so it gets the globe and the cyan tone the picker already used.
• A tab that has since closed keeps the handle as its label rather than rendering blank.