App build hook: AOT-compiles every ui/**.slint of the package into one
staticlib — slint-build codegen plus generated C ABI glue, no
slint-interpreter — and routes it to the app's link hook (ToLinkHook),
which links the final dylib keeping only the components the app uses (see
aot_link.dart). One code asset per .slint file, with id
package:<app>/<path>.aot.g.dart matching the wrappers the
slint_compiler builder generates.
The flag list from rustc's native-static-libs: note in cargoOutput,
or null when the note is absent. Quoted segments ("...", '...',
with \ escapes) stay one flag, so SDK paths containing spaces survive
the round trip through _persistedNativeLinkFlags.
Splits a linker flag line on whitespace, keeping quoted segments whole:
"..." and '...' may contain spaces, a backslash escapes the next
character. The surrounding quotes are stripped; an unterminated quote
runs to the end of the line rather than dropping the flag.
