Add built-in updater, bump to 1.2.0

- predatord checks the Gitea releases every 6 hours, downloads the
  newest pacman package, verifies its SHA-256 from the release notes
  and installs it with `pacman -U` in a separate systemd unit
- Update notice and install button on the System page, in the sidebar
  and in the panel widget; `predatorctl update [--check] [--yes]`
- Optional API token for private repositories
- packaging/release.py builds and publishes releases in the format
  the updater expects

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

predator_control/gui/app.py

@@ -4,9 +4,10 @@ import argparse
 import os
 import sys
 import threading
+import time
 
 from PySide6.QtCore import QObject, Qt, QTimer, Signal
-from PySide6.QtGui import QColor, QIcon
+from PySide6.QtGui import QColor, QIcon, QPalette
 from PySide6.QtNetwork import QLocalServer, QLocalSocket
 from PySide6.QtWidgets import (QApplication, QButtonGroup, QCheckBox, QComboBox, QFrame,
                                QGridLayout, QHBoxLayout, QInputDialog, QLabel, QListWidget,
@@ -673,6 +674,29 @@ class SystemPage(Page):
         self.fw_card.body.addWidget(_muted("Values are stored in the laptop firmware (EC/BIOS)."))
         self.lay.addWidget(self.fw_card)
 
+        upd = Card("Updates")
+        self.upd_head = QLabel("")
+        self.upd_head.setObjectName("big")
+        upd.body.addWidget(self.upd_head)
+        self.upd_text = _muted("")
+        self.upd_text.setTextFormat(Qt.MarkdownText)
+        self.upd_text.setOpenExternalLinks(True)
+        upd.body.addWidget(self.upd_text)
+        h = QHBoxLayout()
+        self.upd_check = QPushButton("Check now")
+        self.upd_check.clicked.connect(lambda: (self.upd_check.setEnabled(False), win.backend.run("check_update")))
+        h.addWidget(self.upd_check)
+        self.upd_install = QPushButton("Install update")
+        self.upd_install.setObjectName("primary")
+        self.upd_install.clicked.connect(self._install)
+        h.addWidget(self.upd_install)
+        self.upd_auto = QCheckBox("Check for updates automatically")
+        self.upd_auto.clicked.connect(lambda v: win.backend.run("set_updates", auto_check=bool(v)))
+        h.addWidget(self.upd_auto)
+        h.addStretch(1)
+        upd.body.addLayout(h)
+        self.lay.addWidget(upd)
+
         svc = Card("Status")
         self.status = _muted("")
         svc.body.addWidget(self.status)
@@ -728,7 +752,37 @@ class SystemPage(Page):
             box.setChecked(bool(info.get("value")))
             box.setToolTip(info.get("error", "") or "")
 
+    def _install(self):
+        u = self.win.state.get("update") or {}
+        if QMessageBox.question(self, "Install update",
+                                "Install Predator Control %s now?\n\nThe background service restarts briefly; "
+                                "reopen the app afterwards." % u.get("latest")) == QMessageBox.Yes:
+            self.upd_install.setEnabled(False)
+            self.win.backend.run("install_update")
+
     def update_state(self, st):
+        u = st.get("update") or {}
+        status = st.get("update_status")
+        self.upd_check.setEnabled(True)
+        if status == "running":
+            self.upd_head.setText("Installing update…")
+            self.upd_text.setText("pacman is installing the new version.")
+            self.upd_install.hide()
+        elif u.get("available"):
+            self.upd_head.setText("Version %s available" % u["latest"])
+            text = "Installed: %s · [Release page](%s)\n\n%s" % (u["current"], u.get("url"), u.get("notes", "").split("### Install")[0].strip())
+            if not u.get("can_install"):
+                text += "\n\n*Automatic install needs the pacman package – otherwise run `git pull && sudo ./install.sh`.*"
+            self.upd_text.setText(text)
+            self.upd_install.setVisible(bool(u.get("can_install")))
+        else:
+            self.upd_head.setText("Up to date" if u else "Not checked yet")
+            when = time.strftime("%d.%m.%Y %H:%M", time.localtime(u["checked"])) if u.get("checked") else "–"
+            extra = "\n\nLast update failed – see: journalctl -u predator-control-update" if status == "failed" else ""
+            err = ("\n\n⚠ %s" % st["update_error"]) if st.get("update_error") else ""
+            self.upd_text.setText("Installed version %s · last check %s%s%s" % (st.get("version"), when, err, extra))
+            self.upd_install.hide()
+        self.upd_auto.setChecked(st["config"].get("updates", {}).get("auto_check", True))
         a = st["available"]
         yes = lambda v: "✔" if v else "✘"
         lines = ["%s Service predatord %s" % (yes(True), st.get("version")),
@@ -833,13 +887,17 @@ class MainWindow(QMainWindow):
         if self.stack.currentWidget() is not bat_page:
             bat_page.indicator.set_battery(st["battery"])  # keep the power history going
         s = st["sensors"]
-        self.footer.setText("%s\nCPU %s °C · GPU %s" % (
+        u = st.get("update") or {}
+        badge = ("⬆ Update %s available\n" % u["latest"]) if u.get("available") else ""
+        self.footer.setText(badge + "%s\nCPU %s °C · GPU %s" % (
             PROFILE_INFO.get(st["profile"], (st["profile"],))[0], s.get("cpu_temp"),
             ("%s °C" % s["gpu_temp"]) if s.get("gpu_temp") else "off"))
 
     def _done(self, cmd, result, err):
         if err:
             self.statusBar().showMessage("Error: %s" % err, 8000)
+        elif cmd == "install_update":
+            self.statusBar().showMessage("Update is being installed…", 8000)
         elif cmd == "get_firmware":
             self.pages["system"][0].firmware(result)
             self.pages["battery"][0].firmware(result)
@@ -860,6 +918,9 @@ def main(argv=None):
     app.setDesktopFileName("predator-control")
     app.setStyle("Fusion")
     app.setStyleSheet(theme.QSS)
+    pal = app.palette()
+    pal.setColor(QPalette.Link, QColor(theme.ACCENT))
+    app.setPalette(pal)
 
     # single instance: forward the requested page to a running window
     name = "predator-control-%d" % os.getuid()