[turbopack] Fix CSS HMR on Safari (#92123)
Fixes #91818
**Regression source:** Commit `b7e4c6a011` ("Turbopack: transpile
CHUNK_SUFFIX") introduced `getChunkSuffixFromScriptSrc()` which reads
query strings from `<script>` tags. On Safari, this picks up the `?ts=`
param injected by the server-side cache-busting workaround in
`render.tsx` (for [WebKit
#187726](https://bugs.webkit.org/show_bug.cgi?id=187726)), baking it
into `ASSET_SUFFIX`. This causes HMR CSS URLs to match the preloaded URL
exactly, re-triggering the Safari preload cache bug and preventing style
updates.
**Changes:**
- **`dev-backend-dom.ts`**: Match existing `<link>` elements by base
path (strip query string) so selectors work across HMR updates with
different `?ts=` values. Add Safari to the Firefox cache-busting branch
so new stylesheet links always get a fresh `?ts=`.
- **`hmr-client.ts`**: Fix `mergeChunkUpdates` so a `total` update
always supersedes any prior update type.
