Feature/chapter read time badge

[DharshiniPujarolla]

Closes #408

Summary

Adds a small "Estimated Read Time" badge to each chapter card, calculated client-side from chapter.content using words / 200 (avg. reading speed).

Changes

• Added getReadTime(content?: string | null): number | null helper
• Extended ChapterType with content?: string | null
• Renders a 📖 ~X min read badge per chapter card, styled with bg-primary/10 / text-primary/70 rounded-pill, consistent with existing conventions in this file
• Badge hides gracefully when content is null, empty, or whitespace-only

Testing

Verified getReadTime() directly:

• 850-word content → 5 (Math.ceil(850/200))
• Empty string → null
• null → null
• Whitespace-only string → null

Confirmed content is included in the /api/ncert/chapters response — repository uses include: { chapters: true } with no field-level select, so no backend changes needed.

Full in-browser visual check was blocked locally by a Google OAuth client_id config issue (unrelated to this change). JSX conditional follows the same pattern as existing conditional UI in this file.

Notes

• No backend/schema changes
• .gitignore updated to exclude .idea/

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[DharshiniPujarolla]

Hi @MRIARC-08 ,
I have done closed the previous pr's and have done the necessary changes.
Please review this pr and let me know if there are any changes
Thank you

[MRIARC-08]

@DharshiniPujarolla Thanks for reopening this. Please clean up the branch before review: pnpm-lock.yaml should not remove the repo security overrides or update the dependency tree for a read-time badge, and the touched page still has Prettier errors. Keep the PR focused on src/app/ncert/[class]/[subject]/page.tsx, run the formatter, and push the result.

[DharshiniPujarolla]

@MRIARC-08,
thanks for the detailed feedback! I've cleaned up the branch:
pnpm-lock.yaml — confirmed no changes here; the security overrides and dependency tree are untouched.
.gitignore — reverted the stray pnpm-workspace.yaml entry that had snuck in.
page.tsx — ran Prettier on src/app/ncert/[class]/[subject]/page.tsx, formatting errors are resolved.
Please reviews this PR.

[DharshiniPujarolla]

@MRIARC-08 can you please go through the changes when you have time and let me know if there is anything i need to do