fix(test): resolve the macOS temp root through its symlink in the launcher and preview tests (#501)

Supersedes #301 by @VassagoDevteam, ported onto the current component layout with fixes from review.

Verified before merge: format, package boundaries, unit suite, build, and the browser tracking suite; a browser harness for the change where one applies; adversarial review applied.

Co-authored-by: Vassago DevTeam <[email protected]>

CHANGELOG.md

@@ -273,6 +273,14 @@ of current runtime behavior, see [`docs/CURRENT-STATE.md`](docs/CURRENT-STATE.md
 
 ### Development
 
+- The CCTV launcher and preview-server tests resolve their temporary fixture
+  root through `fs.realpath`, so they pass on macOS, where the system temp
+  directory is reached through a symlink and the paths the tests compare would
+  otherwise differ. The launcher, preview-server and tool-project tests share one
+  helper that resolves the root, and a case that builds a symlinked temp root
+  explicitly keeps it covered on Linux, whose own temp root is not symlinked.
+  Contributed by VassagoDevteam (#301).
+
 - Extract application lifecycle and viewer exports. Split standalone startup into
   scene setup, controls, layer registration, tools and loading UI. Startup failure
   and terminal shutdown release acquired resources and cancel delayed work.