Keep transcript colors in sync after a hidden theme change (#8199)

* fix(app): preserve adaptive theme events while hidden

Read the current scheme through fresh matchMedia lists so hidden runtime
reads do not consume the pending events on listener-owned lists.

Carry Dan Sabin's fix from #7172 into the current combined Unistyles patch,
and cover both transition directions with a real Electron regression in
the existing desktop browser suite.

Co-authored-by: Dan Sabin <dan@freethinking.it>

* test(desktop): run adaptive theme regression on Linux

Electron retains --no-sandbox in argv, so the positional lookup used the script filename as the artifact directory. Read the final argument so the same real Electron regression exercises Linux as well as macOS.

Co-authored-by: Nurşat Bülbül <85260051+Nurshot@users.noreply.github.com>
Co-authored-by: Dan Sabin <dan@freethinking.it>

---------

Co-authored-by: Nurshot <85260051+Nurshot@users.noreply.github.com>
Co-authored-by: Dan Sabin <dan@freethinking.it>
Co-authored-by: paseo-bot[bot] <266920839+paseo-bot[bot]@users.noreply.github.com>

scripts/postinstall-patches.mjs

@@ -24,6 +24,7 @@ const patchedPackages = [
   },
   // Registry cleanup: remove after react-native-unistyles ships
   // https://github.com/jpudysz/react-native-unistyles/pull/1203.
+  // Adaptive themes: keep until colorScheme reads no longer consume listener-owned media changes.
   // withUnistyles: also keep the uniProps filter until upstream consumes its control prop.
   {
     nodeModulesPath: "node_modules/react-native-unistyles",