ui: the drafts go chrome-less; serif titles name sessions, always (owner round 11)

Both /chat/new drafts lose their TopBar — home's register now: drag
mask first in the DOM, floating sidebar-reopen toggle as the only
pointer-events-auto spot, the empty state carrying the orientation.
The chain picker's own bar then sits at the very top of the column,
exactly like the graph view — no stacked bars, no special-casing.
The chain table drops its 'Chains' title with it: the serif title
register is RESERVED — it always names a session; the table names
nothing, so its bar carries counts + search + close only.

components/top-bar.tsx

@@ -23,7 +23,10 @@
  * - border-b border-border px-3, gap-3 rhythm.
  *
  * The consumer brings the title (font-title text-3xl tracking-tight) and
- * any right-side controls. `drag={false}` is the one escape hatch —
+ * any right-side controls. THE TITLE LAW (owner round 11, 2026-10-05):
+ * the serif title ALWAYS names a session — chrome-less creation surfaces
+ * (home, both /chat/new drafts) and the chain table render NO title.
+ * `drag={false}` is the one escape hatch —
  * chat's rename mode (app-region:drag would eat the mousedown that
  * exits the input; owner ask).
  *