fix dark mode, storybook config, and minor UI issues

- Add color scheme toggle to Storybook preview via globalTypes
- Remove @storybook/addon-actions (built into Storybook 9+)
- Include .storybook/ files in tsconfig.storybook.json
- Fix InlineError show more button color for readability
- Use transparent variant on Remove button for consistent red in dark mode

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/web/package.json

@@ -26,7 +26,6 @@
     "@chromatic-com/storybook": "^5.0.1",
     "@eslint/js": "^9.39.4",
     "@storybook/addon-a11y": "^10.2.19",
-    "@storybook/addon-actions": "^9.0.8",
     "@storybook/addon-docs": "^10.2.19",
     "@storybook/addon-onboarding": "^10.2.19",
     "@storybook/addon-vitest": "^10.2.19",