fix(ui): force the dark theme for all users (was following the OS setting)

VolScope shipped with no .streamlit/config.toml [theme] block, so Streamlit's
base theme silently followed each viewer's prefers-color-scheme. A user whose
OS is in Light Mode therefore saw a broken half-light VolScope (light sidebar
+ widgets against the dark custom-styled content). Pin base="dark" plus the
brand palette so the volatility terminal renders identically dark everywhere.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: 2 people

.streamlit/config.toml

@@ -0,0 +1,13 @@
+# VolScope is a dark volatility terminal. Force the dark base + brand palette
+# so it renders identically regardless of the viewer's OS light/dark setting.
+# Without this, a user whose system is in Light Mode saw a broken light sidebar
+# (Streamlit's base theme silently follows prefers-color-scheme).
+[theme]
+base = "dark"
+primaryColor = "#00d4aa"
+backgroundColor = "#0a0b0f"
+secondaryBackgroundColor = "#12131a"
+textColor = "#e0e4ef"
+
+[browser]
+gatherUsageStats = false