[BUG] Dark mode blinking cursor creates weird visuals

Is there an existing issue for this?

• I have searched the existing issues

Description of the Issue

When in dark mode, and the document is selected and has a blinking cursor, after some seconds it blurs the characters and creates a cascade of visuals from them, if clicked it clears everything but the cycle restarts

Steps To Reproduce

1. Prerequisites: dark mode
2. Open a text file with Notepad++
3. Write more than one line, any text
4. Click anywhere on the document so that the cursor is set and blinking
5. Wait for 5 seconds or mpre

Current Behavior

The characters become blurry and like a halo comes from them that propagates outward (I am not on shrooms even though it sounds like I am xD)

Expected Behavior

The characters and all of the text remains the same, and nothing happens outside of it.

Debug Information

Notepad++ v8.7.9   (64-bit)
Build time : Mar 26 2025 - 03:20:28
Scintilla/Lexilla included : 5.5.5/5.4.3
Boost Regex included : 1_85
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : "C:\catalix-person\AutomationTest\Generic_Keywords\temp_files\custom_csv_file.csv" 
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
Periodic Backup : ON
Placeholders : OFF
Scintilla Rendering Mode : SC_TECHNOLOGY_DIRECTWRITE (1)
Multi-instance Mode : monoInst
File Status Auto-Detection : cdEnabledNew (for current file/tab only)
Dark Mode : ON
OS Name : Windows 11 Enterprise (64-bit)
OS Version : 23H2
OS Build : 22631.5039
Current ANSI codepage : 1252
Plugins : 
    ComparePlus (1.1)
    mimeTools (3.1)
    NppConverter (4.6)
    NppExport (0.4)

Anything else?

No source files, tests, or entry points are named. First reproduce the issue on Windows 11 with dark mode, DirectWrite rendering, and a blinking cursor, then trace the editor's dark-mode and cursor rendering paths. Done means the documented text remains sharp without halo or cascading visuals during the reproduction steps.