Replace raw button/table/input elements with app-button, app-table, app-badge,
app-input, app-pagination. Removed now-redundant button/table/th/td CSS from
the stylesheet (would have double-styled the primitives' projected content
under Angular's emulated encapsulation). Native selects and checkboxes kept
as-is - no Select/Checkbox primitive exists yet.
Production build green, arch:check passes. In-browser verification hit a
dev-server routing hiccup unrelated to these changes (a temporary unguarded
preview route 404'd despite compiling correctly); relied on the identical,
already-verified primitive usage pattern from the Static Pages editor and
Media Manager instead.
