fix: stabilize date range calculation in column view

[kartik-212004]

What does this PR do?

This PR fixes a UI flickering issue in the Column View on the booking page.
When the number of available slots exactly matched the number of columns to display (e.g. 6 days), the date range calculation would enter an infinite loop, alternating between showing the correct range and an extended range (adding an extra week).

• Fixes Booker: Excessive Re-renders in Column View Cause Flickering Date Range & Incorrect Week Calculation #25354 , Date range header blinks repeatedly when navigating calendar views #25350
• Fixes CAL-6805 , CAL-6804

Visual Demo

Before:

awdawd._.Enterprise.Member.1._.Cal.com.-.25.November.2025.1.mp4

After:

awdawd._.Enterprise.Member.1._.Cal.com.-.25.November.2025.mp4

Mandatory Tasks

• I have self-reviewed the code.
• N/A
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

1. Open a booking page with "Column View" enabled.
2. Navigate to a week where there are exactly enough available days to fill the columns (e.g, 6 days for desktop).
3. Observe the date range header.
4. Verify that it does not flicker and shows the correct date range.

[vercel]

@kartik-212004 is attempting to deploy a commit to the cal Team on Vercel.

A member of the Team first needs to authorize it.

[cubic-dev-ai]

1 issue found across 1 file

Prompt for AI agents (all 1 issues)

Understand the root cause of the following 1 issues and fix them.


<file name="packages/features/bookings/Booker/Booker.tsx">

<violation number="1" location="packages/features/bookings/Booker/Booker.tsx:184">
Removing the eslint-disable for `@calcom/eslint/no-scroll-into-view-embed` leaves this `scrollIntoViewSmooth` call violating a rule that is still configured as an error, so the Booker build will now fail linting.</violation>
</file>

_{Reply to cubic to teach it or ask questions. Re-run a review with @cubic-dev-ai review this PR}

[cubic-dev-ai]

No issues found across 1 file

[pallava-joshi]

tested locally too

[github-actions]

E2E results are ready!

• Workflow #90146.1 latest results

[cubic-dev-ai]

No issues found across 1 file

[dhairyashiil]

Looks good!
Thank you for the PR Kartik, and thanks to Pallav for testing it locally.