fix(theme): add search field contrast for metro-teal and neon-love themes

Search input was indistinguishable from the sidebar background in both
dark themes. Add background-color and border overrides matching each
theme's existing settings panel contrast patterns.

Author: pythoninthegrass

app/frontend/styles.css

@@ -352,6 +352,12 @@ aside button:hover svg {
   color: #00c4cc !important;
 }
 
+/* Metro-teal search input needs contrast against #1e1e1e sidebar */
+[data-theme-preset='metro-teal'] [data-testid='sidebar-search'] {
+  background-color: hsl(0 0% 20%) !important;
+  border: 1px solid #404040 !important;
+}
+
 /* Metro-teal toggle overrides (Tailwind bg-primary/bg-muted resolve transparent) */
 [data-theme-preset='metro-teal'] [data-testid='lastfm-toggle'].bg-muted,
 [data-theme-preset='metro-teal'] [data-testid='network-cache-toggle'].bg-muted,
@@ -514,6 +520,12 @@ aside button:hover svg {
   color: #41c8e5 !important;
 }
 
+/* Neon Love search input needs contrast against #2a2041 sidebar */
+[data-theme-preset='neon-love'] [data-testid='sidebar-search'] {
+  background-color: #302250 !important;
+  border: 1px solid #3c2864 !important;
+}
+
 [data-theme-preset='neon-love'] [data-testid='lastfm-toggle'].bg-muted,
 [data-theme-preset='neon-love'] [data-testid='network-cache-toggle'].bg-muted,
 [data-theme-preset='neon-love'] [data-testid='network-cache-persistent-toggle'].bg-muted {