Add wIRC main scrollback, route services to it, remember window bounds, bump to 0.1.7

wIRC main scrollback
- The main window now has a "Server messages" scrollback using the same
  rendering and stick-to-bottom code as channel windows (extracted from
  ChannelScreen into a shared MessageScrollback composable).
- MOTD, numerics, errors, connection status, user modes, INVITE, ERROR,
  non-ACTION CTCP requests and notices/messages from services
  (NickServ, ChanServ, *Serv, Global, ...) and the server go there. Its
  history persists like any other buffer (history/wirc-main__main.json).
- Unread indicator: lines arriving while the main window is unfocused
  show as "N new" next to the label and in the window title/taskbar.

Private messages and /whois
- A PM or notice from a real user opens its query window, and reopens it
  if it was closed. Services and the server no longer open windows.
- /whois <nick> sends WHOIS and shows the formatted reply in the window
  it was typed in, or in wIRC main if that window has since closed.
- /me now sends a proper CTCP ACTION (the \x01 wrapper was missing).

Window position and size
- Main, channel and PM windows remember position and size in
  window_prefs.json under the existing "<serverId>__<name>" key (main
  uses "wirc-main__main"). The new windowX/windowY/windowWidth/
  windowHeight fields are optional, so older files still load.
- A saved position is only used if the window's title strip is on a
  connected monitor; otherwise, and for windows with no saved position,
  windows cascade from the primary screen's top-left with a 32dp offset.
- window_prefs.json is now written via a temp file + atomic move.

Cleanup
- Remove the TEMP DEBUG aliasDebug tracing, ServerRepository.upsert
  printlns and connmgr-debug printlns.

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

src/main/kotlin/data/AliasRepository.kt

@@ -5,13 +5,6 @@ import java.io.File
 import java.net.URI
 import java.net.URLEncoder
 
-// TEMP DEBUG (see task: alias multi-word arguments investigation) - remove once confirmed
-// fixed. Traces the full alias pipeline: raw input -> matched alias -> substituted target
-// -> the actual Desktop API call, so a silent failure anywhere in that chain is visible.
-private fun aliasDebug(msg: String) {
-    println("[alias-debug] $msg")
-}
-
 // Name reserved for the app-level /reload command (ChannelWindow.kt handles it directly,
 // before alias lookup even runs) - kept here too so a line in aliases.txt can never define
 // an alias that would shadow it.
@@ -64,15 +57,9 @@ object AliasRepository {
      * "reload" name, which this repository never loads as an alias).
      */
     fun tryRunAlias(command: String, args: String): Boolean {
-        aliasDebug("tryRunAlias: command=\"$command\" args=\"$args\"")
         val key = command.lowercase()
         if (key == RESERVED_RELOAD) return false
-        val action = aliases[key]
-        if (action == null) {
-            aliasDebug("no alias matched for \"$key\"")
-            return false
-        }
-        aliasDebug("matched \"$key\" -> \"$action\"")
+        val action = aliases[key] ?: return false
         runAction(action, args)
         return true
     }
@@ -94,13 +81,12 @@ object AliasRepository {
         // literal, not a URL delimiter.
         val substitutedArg = if (type == "url") encodeArgForUrl(args) else args
         val target = if (rawTarget.contains("{arg}")) rawTarget.replace("{arg}", substitutedArg) else rawTarget
-        aliasDebug("type=\"$type\" rawTarget=\"$rawTarget\" substitutedArg=\"$substitutedArg\" -> target=\"$target\"")
         if (target.isBlank()) return
 
         try {
             when (type) {
-                "path" -> { aliasDebug("Desktop.open(File(\"$target\"))"); Desktop.getDesktop().open(File(target)) }
-                "url" -> { aliasDebug("Desktop.browse(URI(\"$target\"))"); Desktop.getDesktop().browse(URI(target)) }
+                "path" -> Desktop.getDesktop().open(File(target))
+                "url" -> Desktop.getDesktop().browse(URI(target))
                 // Routed through "cmd /c start" (same launch path as double-clicking in
                 // Explorer or the Run dialog) rather than exec'd directly. A direct
                 // ProcessBuilder(target).start() calls CreateProcess, which does NOT honor
@@ -110,7 +96,7 @@ object AliasRepository {
                 // would. This also preserves bare-name resolution via Windows' App Paths
                 // registry / PATH - not guaranteed to work for every app, since it depends
                 // on that app having registered itself with Windows.
-                "run" -> { aliasDebug("ProcessBuilder start \"$target\""); ProcessBuilder("cmd", "/c", "start", "\"\"", target).start() }
+                "run" -> ProcessBuilder("cmd", "/c", "start", "\"\"", target).start()
                 else -> println("[AliasRepository] Unknown alias action type '$type' in \"$action\"")
             }
         } catch (e: Exception) {