fix: normalize terminalBackground default and drop unrelated lockfile churn

Follow-up to the salvaged terminalBackground commit:
- align the CSS-var fallback and type doc to the runtime default (#000000)
- revert web/package-lock.json to main (the original commit stripped peer
  flags as an npm-version artifact, unrelated to the feature)

web/src/themes/context.tsx

@@ -301,7 +301,7 @@ function applyTheme(theme: DashboardTheme) {
   // Terminal background — read by ChatPage via useTheme(); also available as CSS var.
   root.style.setProperty(
     "--theme-terminal-background",
-    theme.terminalBackground ?? "#0d2626",
+    theme.terminalBackground ?? "#000000",
   );
 }
 

web/src/themes/types.ts

@@ -163,7 +163,7 @@ export interface DashboardTheme {
   componentStyles?: ThemeComponentStyles;
   colorOverrides?: ThemeColorOverrides;
   /** Background color for the embedded terminal pane (xterm.js).
-   *  Hex string. Defaults to `"#0d2626"` when absent. */
+   *  Hex string. Defaults to `"#000000"` when absent. */
   terminalBackground?: string;
 }