[pooramara]

Closes #116
Closes #117
Closes #118
Closes #119

What changed

• Feature: Add an accessibility statement and feedback contact route #116: Accessibility statement dialog with WCAG 2.1 AA info and feedback contact — accessible from footer and mobile menu. Keyboard-accessible with focus trap and Escape to close.
• Feature: Add a compact mobile navigation menu with an accessible toggle #117: Compact mobile navigation menu with accessible toggle (aria-expanded, aria-controls, keyboard-friendly). Collapses nav links into a dropdown on screens ≤768px.
• Feature: Add a table of contents for the module section #118: Table of contents for the module section with expand/collapse toggle and smooth-scroll links to each module card.
• Feature: Add a changelog link to the page footer #119: Changelog link in the page footer pointing to GitHub releases.

How to test

• Feature: Add an accessibility statement and feedback contact route #116: Click "Accessibility statement" in footer → dialog opens with WCAG info and contact link → Close button dismisses.
• Feature: Add a compact mobile navigation menu with an accessible toggle #117: Resize to ≤768px → hamburger toggle appears → click opens menu → aria-expanded updates.
• Feature: Add a table of contents for the module section #118: Click "Show table of contents" under Modules → list of 7 modules appears → click a module name → smooth scrolls to card.
• Feature: Add a changelog link to the page footer #119: Footer now shows "Changelog" link → points to /releases.

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