[Bug]: Tag with accented character gets truncated (`#task/problème` → `#task/probl`) after conversion

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Bug Description

Obsidian version: 1.12.7
TaskNotes: 4.5.3
Similar issues: #1221

Description:
After conversion, a tag containing non-ASCII character (é) is cut off at that character. Example: #task/problème is recognized only as #task/probl. Suspected encoding/UTF-8 handling issue.

Steps to reproduce:

1. Have a todo with the tag #task/problème.
2. Perform checkbox task to TaskNote conversion.
3. Check the output/recognized tag in the task page resulted.

Actual result:
Output shows #task/probl (truncated at è).

Expected result:
Output shows #task/problème intact.

Environment:

• Obsidian 1.12.7
• OS: Windows 10

Possible cause:
String processing that treats bytes instead of Unicode characters; the UTF-8 byte 0xC3 (part of è) may be misinterpreted as a terminator or invalid character.