Webapp redesign phase 4: Updates overview and rollback review

- GET /updates/: one card per updater (Dell, iPXE, Blancco, BPRT) with
  its state, a Check now / Open action and details in accordions; the
  shared download cap is a small popover.
- Dell applies list: one line per apply titled by its first change
  ('Latitude 5350 pack A11 to A12', model looked up in the maps) and
  'and n more'; the chip says how many written files are unchanged since
  the apply. The body lists every change, skipped item, error and file.
- dell_updates.file_status(): per file an apply wrote, unchanged /
  changed / missing by content hash, the same test rollback uses.
  describe(), history_view() and rollback_preview() build on it.
- GET /updates/dell/rollback/<id>: review a rollback before doing it,
  with the files that would be restored and a diff of each. The POST
  route is unchanged; both forms can return to the overview.

webapp/app.py

@@ -130,6 +130,35 @@ def dashboard():
     )
 
 
+@app.route("/updates/")
+def updates_overview():
+    """One card per updater (Dell, iPXE, Blancco, BPRT) and the Dell applies
+    with their rollback state. Each card links to its own page."""
+    from services import blancco_update, bprt_sync, dell_updates, ipxe_update, updates_common
+    scan = dell_updates.last_scan()
+    dell = {"checked": scan.get("checked") if scan else None,
+            "drivers": len(scan.get("drivers") or []) if scan else 0,
+            "bios": len(scan.get("bios") or []) if scan else 0,
+            "drv_updates": sum(1 for r in (scan.get("drivers") or []) if r.get("status") == "update") if scan else 0,
+            "bios_updates": sum(1 for r in (scan.get("bios") or []) if r.get("status") == "update") if scan else 0}
+    rows = ipxe_update.installed()
+    by_name = {r["name"]: r["info"] for r in rows}
+    latest = ipxe_update.last_check()
+    efi = by_name.get("ipxe.efi") or {}
+    ipxe = {"rows": rows, "version": efi.get("version"), "latest": latest,
+            "status": ipxe_update.compare(latest["tag"], efi.get("version")) if latest else None}
+    try:
+        blancco = {"current": blancco_update.current(), "staged": blancco_update.staged()}
+    except Exception as ex:  # a broken release folder must not take the page down
+        blancco = {"current": {}, "staged": [], "error": str(ex)}
+    try:
+        bprt = {"live": bprt_sync.live_summary(), "batches": bprt_sync.batches()}
+    except Exception as ex:
+        bprt = {"live": {}, "batches": [], "error": str(ex)}
+    return render_template("updates_overview.html", dell=dell, ipxe=ipxe, blancco=blancco, bprt=bprt,
+                           history=dell_updates.history_view(10), settings=updates_common.settings())
+
+
 @app.route("/images/import", methods=["GET", "POST"])
 def images_import():
     usb_mounts = system.find_usb_mounts()