Add scrollback text selection/copy, route all /whois output to wIRC main, bump to 0.1.8

- Scrollback (channel windows and wIRC main): mouse drag selection, double-click word,
  triple-click line, shift-click extend, Ctrl+C / Ctrl+Insert, Ctrl+A, Esc, and a
  right-click menu (Copy / Copy line / Select all). Copies one line per message.
  Clipboard writes go off the UI thread with a timeout, like the paste handler.
  Auto-scroll pauses while selecting and catches up once the selection is cleared.
- /whois: header, every reply line, related numerics (401/402/716/263...) and server or
  services notices arriving right after it all go to wIRC main under a bold
  "===== WHOIS <nick> (<server>) =====" header, counted by its unread indicator.

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

build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 }
 
 group = "com.tpuahsiew.wirc"
-version = "0.1.7"
+version = "0.1.8"
 
 // 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 = "0.1.7"
+            packageVersion = "0.1.8"
             windows {
                 menuGroup = "wIRC"
                 upgradeUuid = "8f14e45f-ceea-4a5e-9c3b-5b1f0e8c2b7a"