Vendor Diva.js v7 alongside v6 with a runtime version switch - #970
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Vendor Diva.js v7 alongside v6 with a runtime version switch#970etosphere wants to merge 1 commit into
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As Stage 2 of the Diva v6 -> v7 migration (issue #942), this commit vendors Diva v7.2.2 side-by-side with v6 and wires it into the build, with a runtime switch so v7 can be tested locally without touching the v6 path. DivaAdapter is refactored that delegates to one of two backends chosen at initialize() time via localStorage.setItem("divaBackend", "v7"). DivaBackendV6 is the previous DivaAdapter implementation (the v6 version). DivaBackendV7 is a unfinished implementation that only proves the wiring: OSD 5.0.1 is injected from CDN, the v7 bundle is loaded on demand via a webpack dynamic import (keeping it out of the main bundle on the v6 path), and a Diva v7 viewer mounts over the IIIF manifest. The Cantus-related behaviour (such as events and navigation) is not implemented yet. Diva v7's CSS uses unscoped class names that collide with Bootstrap; gulpfile.mjs now generates a #diva-wrapper-scoped copy from the vendored source files at build time, and DivaBackendV7 suppresses v7's own global style injection using v7's own escape hatch. A height fix in styles.scss ensures v7's flex layout fills the Diva column. This commit contains only source files; the built bundles under nginx/static are not regenerated in this commit.
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Closes #964.