Rewrite app color tokens and fade-up animation.

Tailwind/shadcn imports, light/dark oklch values, and .animate-fade-up stay the same so layout does not shift.

tests/test_periscope_frontend_globals_css_rewrite.py

@@ -0,0 +1,21 @@
+"""App token stylesheet lives under periscope/src."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+SRC = ROOT / "periscope" / "src" / "frontend" / "src" / "app" / "globals.css"
+
+
+def test_globals_css_is_src():
+    text = SRC.read_text(encoding="utf-8")
+    assert "Native Periscope overlay" not in text[:400]
+    assert '@import "tailwindcss"' in text
+    assert '@import "tw-animate-css"' in text
+    assert '@import "shadcn/tailwind.css"' in text
+    assert "@custom-variant dark" in text
+    assert ".animate-fade-up" in text
+    assert "oklch(0.145 0 0)" in text
+    assert "oklch(0.488 0.243 264.376)" in text
+    assert "@apply bg-background text-foreground" in text