Add a global modal/popup system driven entirely from the CMS. A new
`modal` config collection self-targets routes via a glob/regex urlPattern
(optional time window), and its `content` array of block references renders
through the existing BlockRenderer — so markdown, HTML and YouTube blocks
work exactly like a page row. A `modals` list collection holds the active
set behind an enable flag (analogous to `campaigns`).
- modal-match.ts: glob (`*`/`**`) + `~regex` pathname matcher, time window
and modal selection helpers (+ unit tests)
- ContentModal.svelte: immediate/delay/scroll/exit_intent triggers, session
vs. permanent dismiss (sessionStorage + localStorage, keyed by slug+version)
- +layout.server.ts: load `modals-global` in the bootstrap batch, resolve
block images server-side
- +layout.svelte: mount on non-embed routes, match against the current path
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Peter Meier