feat(frontend): create-agent flow — picking a template IS creating the agent

[mmabrouk]

Mahmoud's six create-flow changes:

1. Blank agent = a lone centered composer. New agent → blank no longer shows the templates below; they still show on first run and with a ?template= seed, where the strip is the offer.
2. "Use my coding agent" is gone everywhere — the composer option, the clipboard builder + its test, and the CopiedToast that existed for it.
3. Composer hints: Bold/Italic no longer advertise themselves (⌘/Ctrl+B/I still work); the send/newline pair stays and now names the platform's real modifier — ⌘ on Apple hardware, Ctrl on Windows/Linux — via one shared isMacPlatform/modifierKeyLabel in @agenta/shared, so the hint and the actual binding cannot disagree (the submit plugin accepts meta OR ctrl). Resolved after mount, so SSR cannot hydration-mismatch.
4. Template clicks create directly: the gallery cards, the template detail's action, and the create surface's cards (PR Reviewer etc.) mint the agent and land in its playground with the template's builder instruction as the auto-sent first turn — the same flow as seeding the composer and pressing Create, minus the composer stop. The clicked card shows a spinner until navigation.

18/18 template-URL-state tests pass; the deep-link capture guard from #5832 is untouched.

Stacked on #5846 (it edits the reworked gallery/detail); merge after it.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agenta-documentation	Error		Aug 9, 2026 8:56pm

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[github-actions]

Railway Preview Environment

Status	Destroyed (PR closed)

Updated at 2026-08-09T21:23:03.963Z