Improve the installer, fix context menu on Windows, add CI workflows

scripts/run-beta-installer.cmd

@@ -0,0 +1,54 @@
+@echo off
+setlocal EnableExtensions EnableDelayedExpansion
+
+set "WIN_DESKTOP="
+for /f "skip=1 tokens=1" %%U in ('query user 2^>nul') do (
+  if not defined LOGON set "LOGON=%%U"
+)
+if defined LOGON set "WIN_DESKTOP=C:\Users\%LOGON%\Desktop"
+
+if not exist "%WIN_DESKTOP%\" (
+  for /d %%D in ("C:\Users\*") do (
+    if not defined WIN_DESKTOP (
+      echo %%~nxD | findstr /i /x "Public Default DefaultAccount WsiAccount" >nul
+      if errorlevel 1 if exist "%%D\Desktop\" set "WIN_DESKTOP=%%D\Desktop"
+    )
+  )
+)
+
+if not defined WIN_DESKTOP (
+  echo ERROR: Could not resolve Desktop path
+  exit /b 1
+)
+
+set "INSTALLER="
+for /f "delims=" %%F in ('dir /b /od "%WIN_DESKTOP%\FromChat-Setup-*-beta2.exe" 2^>nul') do set "INSTALLER=%WIN_DESKTOP%\%%F"
+
+if not defined INSTALLER (
+  set "DIST=C:\FromChat\app\app\desktop\build\distributions\release"
+  for /f "delims=" %%F in ('dir /b /od "%DIST%\FromChat-Setup-*-beta2.exe" 2^>nul') do set "INSTALLER=%DIST%\%%F"
+)
+
+if not exist "%INSTALLER%" (
+  echo ERROR: No FromChat-Setup-*-beta2.exe on Desktop or in dist folder
+  exit /b 1
+)
+
+echo Launching installer: %INSTALLER%
+set "TASK=FromChatBetaInstall"
+schtasks /delete /tn "%TASK%" /f >nul 2>&1
+
+for /f "tokens=1-2 delims=:" %%H in ("%TIME%") do set "ST=%%H:%%M"
+set "ST=%ST: =0%"
+
+if defined LOGON (
+  schtasks /create /tn "%TASK%" /tr "\"%INSTALLER%\" --upgrade --launch" /sc once /st %ST% /ru "%LOGON%" /it /f
+) else (
+  schtasks /create /tn "%TASK%" /tr "\"%INSTALLER%\" --upgrade --launch" /sc once /st %ST% /f
+)
+
+schtasks /run /tn "%TASK%" >nul
+ping -n 3 127.0.0.1 >nul
+schtasks /delete /tn "%TASK%" /f >nul 2>&1
+echo Installer started.
+exit /b 0