Replying from an email opened in a new tab was dragging that window to
the left-sidebar dock — same treatment as the main email library, even
though the user had explicitly opted to pop it into its own floating
viewer. Annoying when the viewer is mid-screen and Reply yanks it.
Add an early bail in _snapEmailModalToLeftSidebar for modals whose id
starts with 'email-view-' (the 'open in new tab' reader). Compose still
opens; the floating viewer just stays where it is, on top of the
library. User can move/close it themselves.
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