feat: improve accessibility by adding ARIA labels

[aliyasyeddd]

Description

This PR improves ReadmeForge accessibility by adding ARIA labels, accessible roles, and state attributes across interactive elements. It makes the app more usable for screen reader and keyboard users, in line with the accessibility feature request.

Changes

• Added descriptive aria-label attributes to inputs, textareas, selects, and upload controls
• Added aria-label support for buttons including template actions, preview tabs, screenshot removal, and theme toggle
• Added accessible states such as aria-checked and aria-pressed for toggles and selectable controls
• Improved keyboard accessibility for the upload drop zone and quality panel toggle
• Added accessible heading semantics for editor sections
• Improved live preview accessibility with role="region", aria-live="polite", and dynamic preview labels

Closes : #10

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