fix(ui,backend): async scan with asyncio.gather, fix CVE back button focus

- Replace ThreadPoolExecutor with asyncio.gather + asyncio.to_thread
- Use @work async worker for proper Textual integration
- Add table.focus() after mount to ensure button events are received
- Remove all call_from_thread calls (now in main thread)

full_updater/app.py

@@ -11,7 +11,7 @@ from full_updater.backend.cache import ensure_cache_dir, read_cache, get_cache_t
 from full_updater.backend.scanner import (
     Target, ScanResult, get_lxc_list, lxc_is_running,
     ensure_debsecan_installed, scan_apt, scan_cve, write_cache,
-    run_full_scan
+    run_full_scan_async
 )
 from full_updater.backend.executor import UpgradeExecutor
 from full_updater.ui.loader import LoaderScreen
@@ -57,16 +57,16 @@ class FullUpdaterApp(App):
         self.push_screen(self.loader_screen)
         self.run_scan_all()
 
-    @work(thread=True)
-    def run_scan_all(self):
+    @work
+    async def run_scan_all(self):
         total = len(self.targets)
         completed = 0
 
-        def progress_cb():
+        async def progress_cb():
             nonlocal completed
             completed += 1
             pct = min(100.0, (completed / (total * 4)) * 100)
-            self.call_from_thread(self._update_loader, pct)
+            self._update_loader(pct)
 
         def on_result(result: ScanResult):
             self.results[result.target.target_id] = result
@@ -75,13 +75,13 @@ class FullUpdaterApp(App):
                 if t.target_id == result.target.target_id:
                     idx = i
                     break
-            self.call_from_thread(self._update_loader_status, idx, result.status)
-            self.call_from_thread(self._update_sidebar, result.target.target_id, result)
+            self._update_loader_status(idx, result.status)
+            self._update_sidebar(result.target.target_id, result)
 
-        results = run_full_scan(progress_cb)
+        results = await run_full_scan_async(progress_cb)
         for r in results:
             on_result(r)
-        self.call_from_thread(self._finish_scan)
+        self._finish_scan()
 
     def _update_loader(self, pct: float):
         if self.loader_screen:
@@ -257,6 +257,7 @@ class FullUpdaterApp(App):
         self.mount(table)
         self.query_one("#main-layout").display = False
         table.load_data(pkgs)
+        table.focus()
 
     def on_summary_panel_cve_clicked(self, event: SummaryPanel.CveClicked):
         cache_id = "host" if event.target_id == "host" else event.target_id
@@ -268,6 +269,7 @@ class FullUpdaterApp(App):
         self.mount(table)
         self.query_one("#main-layout").display = False
         table.load_data(cves)
+        table.focus()
 
     def on_package_table_back_pressed(self, event: PackageTable.BackPressed):
         self.query_one("#main-layout").display = True

full_updater/backend/scanner.py

@@ -1,10 +1,11 @@
-import concurrent.futures
+import asyncio
 import re
 import subprocess
 from dataclasses import dataclass, field
 from typing import Any
 
 from full_updater.backend.cache import write_cache
+from datetime import datetime
 
 
 @dataclass
@@ -187,7 +188,6 @@ def scan_single_target(target: Target, progress_cb: Any) -> ScanResult:
         result.status = "error"
 
     cache_id = "host" if target.is_host else target.target_id
-    from datetime import datetime
     write_cache(cache_id, {
         "timestamp": datetime.now().isoformat(),
         "apt_count": result.apt_count,
@@ -200,27 +200,66 @@ def scan_single_target(target: Target, progress_cb: Any) -> ScanResult:
     return result
 
 
-def run_full_scan(progress_cb: Any) -> list[ScanResult]:
+async def scan_single_target_async(target: Target, progress_cb: Any) -> ScanResult:
+    """Version async de scan_single_target (pour asyncio.gather)."""
+    result = ScanResult(target=target)
+    result.status = "running"
+    await progress_cb()
+
+    if not target.is_host and not lxc_is_running(target.target_id):
+        result.status = "skipped"
+        await progress_cb()
+        await progress_cb()
+        await progress_cb()
+        await progress_cb()
+        return result
+
+    debsecan_ok, debsecan_err = await asyncio.to_thread(ensure_debsecan_installed, target.is_host, target.target_id)
+    await progress_cb()
+
+    apt_ok, apt_packages, apt_err = await asyncio.to_thread(scan_apt, target)
+    result.apt_ok = apt_ok
+    result.apt_count = len(apt_packages)
+    result.apt_packages = apt_packages
+    await progress_cb()
+
+    if debsecan_ok:
+        cve_ok, cve_list, cve_err = await asyncio.to_thread(scan_cve, target)
+        result.cve_ok = cve_ok
+        result.cve_count = len(cve_list)
+        result.cve_list = cve_list
+        if not cve_ok:
+            result.error = cve_err
+    else:
+        result.cve_ok = False
+        result.error = f"debsecan: {debsecan_err}"
+    await progress_cb()
+
+    result.status = "done" if (result.apt_ok and result.cve_ok) else "error"
+    if result.error:
+        result.status = "error"
+
+    cache_id = "host" if target.is_host else target.target_id
+    write_cache(cache_id, {
+        "timestamp": datetime.now().isoformat(),
+        "apt_count": result.apt_count,
+        "apt_packages": result.apt_packages,
+        "cve_count": result.cve_count,
+        "cve_list": result.cve_list,
+        "error": result.error
+    })
+    await progress_cb()
+    return result
+
+
+async def run_full_scan_async(progress_cb: Any) -> list[ScanResult]:
     targets = [Target(target_id="host", name="hote", is_host=True)] + get_lxc_list()
-    results = []
-    completed = 0
-    total = len(targets)
-
-    def _progress():
-        nonlocal completed
-        completed += 1
-        pct = min(100.0, (completed / (total * 4)) * 100)
-        progress_cb(pct)
-
-    with concurrent.futures.ThreadPoolExecutor(max_workers=8) as executor:
-        futures = {executor.submit(scan_single_target, t, _progress): t for t in targets}
-        for future in concurrent.futures.as_completed(futures):
-            try:
-                result = future.result()
-                results.append(result)
-            except Exception as e:
-                target = futures[future]
-                result = ScanResult(target=target, status="error", error=str(e))
-                results.append(result)
-
-    return results
+    coros = [scan_single_target_async(t, progress_cb) for t in targets]
+    results = await asyncio.gather(*coros, return_exceptions=True)
+    out = []
+    for r in results:
+        if isinstance(r, Exception):
+            out.append(ScanResult(target=Target(target_id="unknown", name="unknown", is_host=False), status="error", error=str(r)))
+        else:
+            out.append(r)
+    return out