feat(home): add JEE 2026 admissions open house section

[DARK-1926]

PR Type

What kind of change does this PR introduce?

• Moved the B.Tech SeatMatrix component to the top of the page (full-width layout) to improve readability of the wide seat matrix table.
• Created OpenHouseSection component featuring the Open House flyer and registration details for JEE (Main) 2026 candidates.

[ ] Bugfix
[ ] Feature
[.] Release
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Tests
[ ] Other

The GH-Issue (if any)

Closes #

What's new?

Screenshots

N/A