Lift the whole subscribed-view header — tabs, sync stats + actions, the
intro, the tag chips and the sync-status chips — into the shell's fixed
band via PageToolbar. Combined with the sticky table header row, only the
channel rows scroll now; everything above them stays put.
The status chips move out of DataTable's controlsLeading into the fixed
chrome (they belong above the header, not in the scrolling controls row).
Note: the DataTable pager (rows-per-page / pagination) stays in the
scroller for now — it rarely shows on the manager (few channels = one
page). The discovery sub-view's chrome is still inline (separate
component, handled in the sweep). Suite 15/15, tsc + knip clean.
peter
dcadbe346d