Add lines, functions, and statements at 80% alongside branches in both
the server (vite.config.ts) and client (vitest.client-coverage.config.ts)
coverage gates — branch-only thresholds allow misleadingly sparse tests to
pass the gate.
Also adds a plugin-sync comment to vitest.client-coverage.config.ts listing
the four Vite plugins mirrored from vite.config.ts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Vitest 4 silently ignores per-project coverage overrides in test.projects,
so a standalone vitest.client-coverage.config.ts provides the root-level
Istanbul coverage block that Vitest actually honours.
Root vite.config.ts retains the v8 coverage block (reportsDirectory:
coverage/server) for the server project. The client config writes to
coverage/client and instruments all .svelte and .svelte.ts files.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>