feat: rebrand to MMD PDF, single corporate theme, and remove original text under an edit

- Services/PdfRedactText.cs: strip text whose origin falls inside a CoverAnnotation
  from the page content stream at save time, hooked into PdfBurn.DrawAnnotationsIntoDoc.
  Fixes edited values staying recoverable by text extraction.
- Themes/MMD.xaml replaces all thirteen themes; picker and accent strip removed; no dark mode.
- Rename KillerPDF -> MMD PDF across code, resources, packaging and locale strings; new icon.
- Remove the upstream author credit and the in-app install button.

choco/tools/chocolateyInstall.ps1

@@ -1,13 +1,13 @@
 $ErrorActionPreference = 'Stop'
 $toolsDir  = Split-Path -Parent $MyInvocation.MyCommand.Definition
 $version   = $env:ChocolateyPackageVersion
-$installDir = Join-Path $env:ProgramFiles 'KillerPDF'
-$installExe = Join-Path $installDir 'KillerPDF.exe'
+$installDir = Join-Path $env:ProgramFiles 'MmdPdf'
+$installExe = Join-Path $installDir 'MmdPdf.exe'
 
 $packageArgs = @{
     packageName    = $env:ChocolateyPackageName
-    fileFullPath   = Join-Path $toolsDir 'KillerPDF.exe'
-    url64bit       = "https://github.com/SteveTheKiller/KillerPDF/releases/download/v$version/KillerPDF.exe"
+    fileFullPath   = Join-Path $toolsDir 'MmdPdf.exe'
+    url64bit       = "https://github.com/SteveTheKiller/MmdPdf/releases/download/v$version/MmdPdf.exe"
     checksum64     = 'REPLACE_HASH'
     checksumType64 = 'sha256'
 }
@@ -16,8 +16,8 @@ Get-ChocolateyWebFile @packageArgs
 
 # Copy to Program Files
 New-Item -ItemType Directory -Force -Path $installDir | Out-Null
-Copy-Item (Join-Path $toolsDir 'KillerPDF.exe') $installExe -Force
+Copy-Item (Join-Path $toolsDir 'MmdPdf.exe') $installExe -Force
 
 # Start Menu shortcut (All Users)
-$startMenuPath = Join-Path $env:ProgramData 'Microsoft\Windows\Start Menu\Programs\KillerPDF.lnk'
+$startMenuPath = Join-Path $env:ProgramData 'Microsoft\Windows\Start Menu\Programs\MmdPdf.lnk'
 Install-ChocolateyShortcut -ShortcutFilePath $startMenuPath -TargetPath $installExe

choco/tools/chocolateyUninstall.ps1

@@ -1,7 +1,7 @@
 $ErrorActionPreference = 'Stop'
 
-$installDir = Join-Path $env:ProgramFiles 'KillerPDF'
+$installDir = Join-Path $env:ProgramFiles 'MmdPdf'
 if (Test-Path $installDir) { Remove-Item $installDir -Recurse -Force }
 
-$startMenuPath = Join-Path $env:ProgramData 'Microsoft\Windows\Start Menu\Programs\KillerPDF.lnk'
+$startMenuPath = Join-Path $env:ProgramData 'Microsoft\Windows\Start Menu\Programs\MmdPdf.lnk'
 if (Test-Path $startMenuPath) { Remove-Item $startMenuPath -Force }