Add a local web viewer for runs

`strix view` opens a run in the browser, served locally from the run files
(nothing is uploaded). There's also a quick link to it from the TUI and the
end-of-run summary.

pyproject.toml

@@ -74,6 +74,10 @@ build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
 packages = ["strix"]
+# The prebuilt viewer bundle under strix/viewer/viewer_dist/ ships automatically
+# (hatchling includes non-.py files under the package). The Vite SOURCE lives
+# under the package dir too but must never ship in the wheel.
+exclude = ["strix/viewer_src", "strix/viewer_src/**"]
 
 # ============================================================================
 # Type Checking Configuration