Cryptext x64 - GUI integration based on original ENTERPASSDLG
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Only the main-window presentation was changed in scr\src\Cryptext64.asm.
The reference is Cryptext64_GUI_Preview.asm / original ENTERPASSDLG:
232 x 106 DLU, MS Sans Serif 8 pt, original control positions/styles.

Preserved:
- all current control IDs and command handlers
- encryption/decryption, CT64FILE, ground-password and SecureInput logic
- vault, tray, single-instance, Explorer Quick Mode, command line
- tooltip/RAM/About/Easter-egg logic
- Common Controls v6 dependency for native themed Windows controls

Main GUI changes:
- original DLU-derived geometry and spacing
- original control styles
- no BS_FLAT on the four right-side buttons
- OK remains BS_DEFPUSHBUTTON
- password field receives initial focus
- first radio remains selected initially
- main Change-password caption follows the original: no trailing ellipsis
- themed checkbox/radios/buttons remain native Windows controls
- the second radio is widened only enough to fit the newer, longer caption
  "Bis zur Windows-Abmeldung merken"; its position and height remain unchanged

DPI policy from dev21:
- Cryptext intentionally does not declare Per-Monitor DPI awareness in the EXE
  manifest. At display scales above 100 %, Windows may proportionally scale the
  complete application surface. Slight bitmap softness is accepted in favor of
  preserving the same visual proportions.

Build note:
This environment does not contain a runnable FASM 1.73.35 toolchain, so the
source was statically checked here but not assembled. Build with the project's
normal C:\fasm\FASM.EXE / INCLUDE setup.
