F2: navigateFallbackDenylist was missing the server's `l/:alias` vanity
short-link, so a top-nav to /l/<alias> after SW registration got the
index.html app shell (which has no /l route) and dead-ended on Error404
instead of the server's 302 redirect. Add /^\/l(\/|$)/ mirroring main.ts.
F3: the partial-failure branch of "make page available offline" showed a
bare generic toast; include result.failed step labels in the message per
AGENTS.md (errors must be specific), matching the catch-branch below it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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