Fix UI padding and text flush against container edges

- Remove global * { padding: 0 } reset that was overriding all Tailwind
  padding classes (unlayered CSS beats Tailwind v4 @layer utilities)
- Add color-scheme: dark to fix native form controls (select dropdowns)
  rendering with white backgrounds
- Make sidebar responsive (25% width, min 224px, max 320px)
- Increase internal padding on TopBar, Sidebar, ProjectList, StatusBar
- Add flex-shrink-0 to TopBar status indicators to prevent clipping
- Allow project action buttons to wrap on narrow sidebars
- Increase terminal view padding for breathing room

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src/components/settings/AwsSettings.tsx

@@ -83,7 +83,7 @@ export default function AwsSettings() {
           <select
             value={globalAws.aws_profile ?? ""}
             onChange={(e) => handleChange("aws_profile", e.target.value)}
-            className="w-full px-2 py-1.5 text-xs bg-[var(--bg-primary)] border border-[var(--border-color)] rounded focus:outline-none focus:border-[var(--accent)]"
+            className="w-full px-2 py-1.5 text-xs bg-[var(--bg-primary)] text-[var(--text-primary)] border border-[var(--border-color)] rounded focus:outline-none focus:border-[var(--accent)]"
           >
             <option value="">None (use default)</option>
             {profiles.map((p) => (