feat(stories): add theme control to all component stories

[baadhira]

Closes #20958

Adds the theme control to all component story files for consistent visual testing across themes.

Changelog

New

{{new thing}}

Changed

• Adds the 'theme' argType and default 'g10' arg to all component story files to enable theme switching in Storybook.

Removed

{{removed thing}}

Testing / Reviewing

For each component story file modified (e.g., ContentSwitcher, Tooltip, TreeView, etc.), verify that the 'theme' control is present and functional in the Storybook Controls tab. Switching the theme should visually update the component (where applicable).

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

More details can be found in the pull request guide

[github-actions]

All contributors have signed the DCO.
_{Posted by the DCO Assistant Lite bot.}

[netlify]

✅ Deploy Preview for v11-carbon-react ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	4175355
🔍 Latest deploy log	https://app.netlify.com/projects/v11-carbon-react/deploys/69315bb78a62f8000858367f
😎 Deploy Preview	https://deploy-preview-21125--v11-carbon-react.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for v11-carbon-web-components ready!

Name	Link
🔨 Latest commit	c9d0ebf
🔍 Latest deploy log	https://app.netlify.com/projects/v11-carbon-web-components/deploys/69315d1e37677f0008668d8e
😎 Deploy Preview	https://deploy-preview-21125--v11-carbon-web-components.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for carbon-elements ready!

Name	Link
🔨 Latest commit	4175355
🔍 Latest deploy log	https://app.netlify.com/projects/carbon-elements/deploys/69315bb73ea1170008644b31
😎 Deploy Preview	https://deploy-preview-21125--carbon-elements.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[baadhira]

recheck

[baadhira]

custom-pr-sign-comment: I have read the DCO document and I hereby sign the DCO.

[baadhira]

I have read the DCO document and I hereby sign the DCO.

[baadhira]

recheck

[netlify]

✅ Deploy Preview for carbon-elements ready!

Name	Link
🔨 Latest commit	b548597
🔍 Latest deploy log	https://app.netlify.com/projects/carbon-elements/deploys/69315fcbbd7c150008854353
😎 Deploy Preview	https://deploy-preview-21125--carbon-elements.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for v11-carbon-react ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	b548597
🔍 Latest deploy log	https://app.netlify.com/projects/v11-carbon-react/deploys/69315fcb97c0390008bf5fbd
😎 Deploy Preview	https://deploy-preview-21125--v11-carbon-react.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[netlify]

✅ Deploy Preview for v11-carbon-web-components ready!

Name	Link
🔨 Latest commit	b548597
🔍 Latest deploy log	https://app.netlify.com/projects/v11-carbon-web-components/deploys/69315fcb97c0390008bf5fc1
😎 Deploy Preview	https://deploy-preview-21125--v11-carbon-web-components.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[kennylam]

Hi @baadhira, the theme switcher is already built into Storybook. Is this PR meant to address something else? Also, the theme controls added in this PR don't work for me.

[maradwan26]

Hi @baadhira, the issue #20958 is for adding controls to the Theme stories, not adding theme controls to all stories.