splash(feature-highlights): add the search-queue card — "run several searches at once, no babysitting"

Concurrent-Agent-Searches shipped (queue rail, search-results remote :3018) and
was verified against code this pass, so it earns a curated highlight alongside
the other Live features — not just a changelog line. Plain-language framing:
fire many, walk away, triage on arrival. Slotted at order 25, after "All your
research."

Force-added: a bare `content` line in .gitignore over-broadly ignores
splash/src/content, so new highlight files need -f (the existing eight are
grandfathered as already-tracked). Flagged for a follow-up gitignore tightening.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018UYTYu4MAFZ7iyr2VTo2kq

Author: mpstaton

splash/src/content/feature-highlights/fire-many-searches.md

@@ -0,0 +1,16 @@
+---
+title: Run several searches at once, no babysitting
+lede: Agent searches take minutes — so fire as many as you want and keep working. Each one lands in its own card on the right when it's ready for you.
+order: 25
+status: Live
+icon: ⇉
+featured: false
+tags: [Search, Queue, Triage]
+---
+
+You used to fire one search and wait, watching a single column until it
+finished. Now every search you kick off drops into a queue on the right as its
+own card — showing what it's working on and roughly how long it usually takes.
+Start three, start ten, then go do something else. When results arrive the card
+signals you; open it, keep what's good, and clear it. Fire many, deal with them
+as they come.