Create Revise page UI

## Description

Create a Revise page that helps users revisit topics and improve their performance. The page should allow users to select chapters for revision and view their test consistency through a calendar and stats section.

## Requirements

* Add sidebar navigation
* Add chapter selection menu
* Add calendar component to show test activity
* Add stats component to display user consistency

No files, tests, or entry points are named. Start by locating the existing page and sidebar patterns, then identify how chapter selection, calendar activity, and user stats are represented; the work is done when the Revise page provides all four requested UI areas and supports chapter selection.

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