Merge pull request #95 from alvin000009238/codex/fix-csp-issue-with-inline-theme-init-script-i8s1np

Cache chart theme palette, add theme-init, expose chart test hooks, and add theme tests

Author: alvin000009238

public/theme-init.js

@@ -1,6 +1,11 @@
 (() => {
-    const storedTheme = localStorage.getItem('grades-theme');
-    if (storedTheme === 'light') {
-        document.documentElement.setAttribute('data-theme', 'light');
+    try {
+        const storedTheme = localStorage.getItem('grades-theme');
+        if (storedTheme === 'light') {
+            document.documentElement.setAttribute('data-theme', 'light');
+        }
+    } catch {
+        // Ignore storage access failures (privacy mode / blocked storage)
+        // and keep default theme.
     }
 })();