Improve logging defaults

- Cap default log file space usage at 500 MB, down from 4 GB (no normal
  person cares about having this many logs more than their own files)
- Don't log spammy debug and info messages in Qt software by default
- Wrap long lines in `journalctl` output so you can actually see them,
  and copy them for debugging elsewhere

mkosi.extra/etc/systemd/journald.conf.d/00-kde-linux-default.conf

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Nate Graham <nate@kde.org>
+
+# Precious disk space is for user files; cap max log size to something reasonable
+SystemMaxUse=500M

mkosi.extra/etc/xdg/QtProject/qtlogging.ini

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+# SPDX-FileCopyrightText: 2026 Nate Graham <nate@kde.org>
+
+# Don't log spammy debug and info messages by default
+[Rules]
+
+default=true
+
+*.debug=false
+*.info=false
+*.warning=true
+*.critical=true

mkosi.extra/usr/share/zsh/plugins/kde-linux-default/kde-linux-default-zshrc.zsh

@@ -89,3 +89,7 @@ alias grep='grep --color=auto'
 alias la='ls -A'
 alias ll='ls -l'
 alias lla='ls -lA'
+
+# Wrap journal logs viewed in terminal rather than truncating; friendlier for reading
+# and copying
+export SYSTEMD_LESS=FRXMK