Unable to type hash (#) character

### Operating System and Version

macOS Sequoia 15.5

### Distribution

NotepadNext-v0.12.dmg

### Description

On the Mac build, it isn't possible to type a hash ('#') in the main editor window. It is possible, however, in the dialogs (e.g the 'Find' field). On a Mac, the key combination to get a '#' is Option+3 [⌥3]. This is show-stopper for using NotepadNext when editing source files for shell scripts or Python, where the hash used for comments.

I suspect this is due to intercepting the Option key, as the same bug also holds for the Euro currency symbol (€), which on a Mac is ⌥2

### Steps to Reproduce

1. Open the editor - a new or existing document
2. Press Option+3 [⌥3]

### Expected Outcome
A hash character appears

### Actual Outcome
Nothing happens

### Debug Information

Notepad Next v0.12
Qt version 6.5.3
macOS Sequoia 15.5 (24F74)

### Additional Details

e.g. screenshots, logs, etc

Reproduce the issue on macOS Sequoia 15.5 in the main editor window, comparing Option+3 and Option+2 with the Find dialog where both symbols work. Trace the Qt keyboard handling and Option-key interception for the editor; done means # and € can be entered in the editor while existing dialog input remains unaffected.

Written by the indexing model from the issue text.