Added keyboard shortcut (CTRL + T) (web support)

[ayn-aval]

What kind of change does this PR introduce?

• Implements Ctrl+T shortcut to quickly add text elements

Issue Number:

• Fixes Feature Request : Add a shortcut key (Ctrl + T) for adding text on the canvas for web users #144

Summary

• Updates KeyboardShortcuts widget in web_utils.dart
• Adds _handleAddTextmethod to canvas screen
• Updates keyboard shortcuts "help dialog" to include the new shortcut
• Improves web user productivity with keyboard shortcuts

Does this PR introduce a breaking change?

• No

Have you read the contributing guide , README.md , code of conduct?

• Yes

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[may-tas]

@ayn-aval Looks good enough—let's merge it.

[ayn-aval]

Thank you @may-tas .