graph: session deep links reliably jump to the source message

The mount-time jump never fired on real graph-link arrivals: the
transcript scroller's ref is attached by a later sibling, and the queued
rAF was cancelled outright whenever use-stick-to-bottom re-created its
context while the initial scroll settled — every link landed at the
bottom (owner report 2026-10-13).

Rewrite the mount path as a synchronous 64ms retry watcher that keeps
running past its first success (hydration/adoption can replace the
jumped-to node), with a ~20s watchdog for cold-compile SSR streams
(observed 6.8s). jump() now reads the stick-to-bottom context through a
ref so effect identities stay stable, and the unmount cleanup no longer
strips a live flash. Verified live on real data: full load, SPA link
navigation, and in-session hashchange all land the anchor 16px from the
scroller top with the 2s highlight.

Also gives the node card's session/file rows matching horizontal and
vertical padding (px-2 py-1.5).

components/graph-view.tsx

@@ -1658,7 +1658,7 @@ export function GraphView({
 									return (
 										<div key={sourceId} className="flex items-center gap-1.5">
 											<FileTextIcon className="size-3.5 shrink-0 text-muted-foreground" />
-											<span className="min-w-0 flex-1 truncate px-1 py-1 text-sm text-muted-foreground">
+											<span className="min-w-0 flex-1 truncate px-2 py-1.5 text-sm text-muted-foreground">
 												{snapshot.fileSources[sourceId]}
 											</span>
 										</div>
@@ -1670,7 +1670,7 @@ export function GraphView({
 										<Link
 											href={propositionSessionHref(selected.node, sourceId)}
 											scroll={false}
-											className="min-w-0 flex-1 truncate rounded-md px-1 py-1 text-sm text-foreground transition-colors hover:bg-accent"
+											className="min-w-0 flex-1 truncate rounded-md px-2 py-1.5 text-sm text-foreground transition-colors hover:bg-accent"
 										>
 											{snapshot?.sessions[sourceId] ?? sourceId}
 										</Link>