feat: add NSIS Windows installer to release workflow

- installer.nsi: per-user install to AppData, Start Menu shortcuts,
  optional desktop shortcut and autostart, clean uninstall (preserves
  data/), Add/Remove Programs registration
- build-dist-windows.sh: runs makensis after ZIP if available
- release.yml: install nsis in CI, upload both ZIP and setup.exe
- Fix Docker registry login (sed -E for https:// stripping)

installer.nsi

@@ -0,0 +1,148 @@
+; LedGrab NSIS Installer Script
+; Cross-compilable on Linux: apt install nsis && makensis installer.nsi
+;
+; Expects the portable build to already exist at build/LedGrab/
+; (run build-dist-windows.sh first)
+
+!include "MUI2.nsh"
+!include "FileFunc.nsh"
+
+; ── Metadata ────────────────────────────────────────────────
+
+!define APPNAME "LedGrab"
+!define DESCRIPTION "Ambient lighting system — captures screen content and drives LED strips in real time"
+!define VERSIONMAJOR 0
+!define VERSIONMINOR 1
+!define VERSIONBUILD 0
+
+; Set from command line: makensis -DVERSION=0.1.0 installer.nsi
+!ifndef VERSION
+  !define VERSION "${VERSIONMAJOR}.${VERSIONMINOR}.${VERSIONBUILD}"
+!endif
+
+Name "${APPNAME} v${VERSION}"
+OutFile "build\${APPNAME}-v${VERSION}-win-x64-setup.exe"
+InstallDir "$LOCALAPPDATA\${APPNAME}"
+InstallDirRegKey HKCU "Software\${APPNAME}" "InstallDir"
+RequestExecutionLevel user
+SetCompressor /SOLID lzma
+
+; ── Modern UI Configuration ─────────────────────────────────
+
+!define MUI_ABORTWARNING
+!define MUI_ICON "server\src\wled_controller\static\icon-192.png"
+!define MUI_UNICON "server\src\wled_controller\static\icon-192.png"
+
+; ── Pages ───────────────────────────────────────────────────
+
+!insertmacro MUI_PAGE_WELCOME
+!insertmacro MUI_PAGE_DIRECTORY
+!insertmacro MUI_PAGE_COMPONENTS
+!insertmacro MUI_PAGE_INSTFILES
+!insertmacro MUI_PAGE_FINISH
+
+!insertmacro MUI_UNPAGE_CONFIRM
+!insertmacro MUI_UNPAGE_INSTFILES
+
+!insertmacro MUI_LANGUAGE "English"
+
+; ── Installer Sections ──────────────────────────────────────
+
+Section "!${APPNAME} (required)" SecCore
+  SectionIn RO
+
+  SetOutPath "$INSTDIR"
+
+  ; Copy the entire portable build
+  File /r "build\LedGrab\python"
+  File /r "build\LedGrab\app"
+  File "build\LedGrab\LedGrab.bat"
+
+  ; Create data and logs directories
+  CreateDirectory "$INSTDIR\data"
+  CreateDirectory "$INSTDIR\logs"
+
+  ; Create uninstaller
+  WriteUninstaller "$INSTDIR\uninstall.exe"
+
+  ; Start Menu shortcuts
+  CreateDirectory "$SMPROGRAMS\${APPNAME}"
+  CreateShortcut "$SMPROGRAMS\${APPNAME}\${APPNAME}.lnk" "$INSTDIR\LedGrab.bat" \
+    "" "" "" SW_SHOWMINIMIZED "" "${DESCRIPTION}"
+  CreateShortcut "$SMPROGRAMS\${APPNAME}\Uninstall.lnk" "$INSTDIR\uninstall.exe"
+
+  ; Registry: install location + Add/Remove Programs entry
+  WriteRegStr HKCU "Software\${APPNAME}" "InstallDir" "$INSTDIR"
+  WriteRegStr HKCU "Software\${APPNAME}" "Version" "${VERSION}"
+
+  WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "DisplayName" "${APPNAME}"
+  WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "DisplayVersion" "${VERSION}"
+  WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "UninstallString" '"$INSTDIR\uninstall.exe"'
+  WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "InstallLocation" "$INSTDIR"
+  WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "Publisher" "Alexei Dolgolyov"
+  WriteRegStr HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "URLInfoAbout" "https://git.dolgolyov-family.by/alexei.dolgolyov/wled-screen-controller-mixed"
+  WriteRegDWORD HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "NoModify" 1
+  WriteRegDWORD HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "NoRepair" 1
+
+  ; Calculate installed size for Add/Remove Programs
+  ${GetSize} "$INSTDIR" "/S=0K" $0 $1 $2
+  IntFmt $0 "0x%08X" $0
+  WriteRegDWORD HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}" \
+    "EstimatedSize" "$0"
+SectionEnd
+
+Section "Desktop shortcut" SecDesktop
+  CreateShortcut "$DESKTOP\${APPNAME}.lnk" "$INSTDIR\LedGrab.bat" \
+    "" "" "" SW_SHOWMINIMIZED "" "${DESCRIPTION}"
+SectionEnd
+
+Section "Start with Windows" SecAutostart
+  CreateShortcut "$SMSTARTUP\${APPNAME}.lnk" "$INSTDIR\LedGrab.bat" \
+    "" "" "" SW_SHOWMINIMIZED "" "${DESCRIPTION}"
+SectionEnd
+
+; ── Section Descriptions ────────────────────────────────────
+
+!insertmacro MUI_FUNCTION_DESCRIPTION_BEGIN
+  !insertmacro MUI_DESCRIPTION_TEXT ${SecCore} \
+    "Install ${APPNAME} server and all required files."
+  !insertmacro MUI_DESCRIPTION_TEXT ${SecDesktop} \
+    "Create a shortcut on your desktop."
+  !insertmacro MUI_DESCRIPTION_TEXT ${SecAutostart} \
+    "Start ${APPNAME} automatically when you log in."
+!insertmacro MUI_FUNCTION_DESCRIPTION_END
+
+; ── Uninstaller ─────────────────────────────────────────────
+
+Section "Uninstall"
+  ; Remove shortcuts
+  Delete "$SMPROGRAMS\${APPNAME}\${APPNAME}.lnk"
+  Delete "$SMPROGRAMS\${APPNAME}\Uninstall.lnk"
+  RMDir "$SMPROGRAMS\${APPNAME}"
+  Delete "$DESKTOP\${APPNAME}.lnk"
+  Delete "$SMSTARTUP\${APPNAME}.lnk"
+
+  ; Remove application files (but NOT data/ — preserve user config)
+  RMDir /r "$INSTDIR\python"
+  RMDir /r "$INSTDIR\app"
+  Delete "$INSTDIR\LedGrab.bat"
+  Delete "$INSTDIR\uninstall.exe"
+
+  ; Remove logs (but keep data/)
+  RMDir /r "$INSTDIR\logs"
+
+  ; Try to remove install dir (only succeeds if empty — data/ may remain)
+  RMDir "$INSTDIR"
+
+  ; Remove registry keys
+  DeleteRegKey HKCU "Software\${APPNAME}"
+  DeleteRegKey HKCU "Software\Microsoft\Windows\CurrentVersion\Uninstall\${APPNAME}"
+SectionEnd