Snap windows to the desktop grid and to whole lines, font size picker (10 to 18), white text in settings dialogs, bump to 0.1.12

- After a move, windows snap to the Windows desktop icon grid; after a resize,
  the window height is trimmed so the scrollback ends on a whole line.
- The font size slider is replaced by square 10 to 18 buttons. Sizes saved by
  the old slider round to the nearest picker size.
- Settings and font dialogs always use white text, so a dark window text color
  no longer makes their labels invisible.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 }
 
 group = "com.tpuahsiew.wirc"
-version = "0.1.11"
+version = "0.1.12"
 
 // No project-level repositories{} block here: settings.gradle.kts sets
 // dependencyResolutionManagement.repositoriesMode = FAIL_ON_PROJECT_REPOS and already
@@ -38,7 +38,7 @@ compose.desktop {
             appResourcesRootDir.set(project.file("installerResources"))
             targetFormats(TargetFormat.Msi, TargetFormat.Exe)
             packageName = "wIRC"
-            packageVersion = "0.1.11"
+            packageVersion = "0.1.12"
             windows {
                 menuGroup = "wIRC"
                 upgradeUuid = "8f14e45f-ceea-4a5e-9c3b-5b1f0e8c2b7a"