fix: tooltip input closes unexpectedly and Enter key breaks tooltip

[zoherr]

Summary

This PR fixes multiple related issues where the tooltip inline tool becomes unusable:

• Tooltip input closes immediately on click
• Tooltip input loses focus
• Pressing Enter breaks selection or creates empty tooltip
• Tooltip text is not applied reliably

Root Cause

Editor.js captures the Enter key before the tooltip input receives focus.
This causes selection loss and toolbar closure.

Fix

• Auto-focus tooltip input when opened
• Prevent Enter key from bubbling to Editor.js while tooltip input is open
• Safely apply tooltip text only when input is focused

Issues Fixed

Closes #137
Closes #139
Closes #142

Tested

• Editor.js v2.x
• React + Vite
• Chrome (latest)

[zoherr]

This PR addresses three related issues caused by Enter key propagation and missing input focus.
Happy to adjust if maintainers prefer a different approach.