Fix Manage Kits for apps read from a device

The schema built from a Sox session spelled checksums as signed decimals,
so no kit matched a manifest: Installed showed raw checksums and Action
read "Keep at checksum ...". They are now 8 hex digits like a .sax file,
and checksums compare regardless of zero-padding.

A device session only loads folders as they are opened, so only sys
counted as used. Used kits now come from the whole component tree, read
one request at a time so a small controller is not flooded into dropping
the session.

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

manage_kits.py

@@ -82,6 +82,11 @@ def column_label(version, checksum):
     return version if version else checksum
 
 
+def same_checksum(a, b):
+    """Whether two checksums name the same build, whatever their zero-padding."""
+    return bool(a) and bool(b) and a.lower().lstrip("0") == b.lower().lstrip("0")
+
+
 def action_options(kit_name, current_checksum, is_declared, builds):
     """The Action dropdown for one kit: (label, checksum to apply) pairs, no-op first.
 
@@ -91,7 +96,7 @@ def action_options(kit_name, current_checksum, is_declared, builds):
     """
     installed_version = None
     for version, checksum in builds:
-        if checksum == current_checksum:
+        if same_checksum(checksum, current_checksum):
             installed_version = version
             break
 
@@ -109,7 +114,7 @@ def action_options(kit_name, current_checksum, is_declared, builds):
     installed_rank = palette.version_sort_key(installed_version) if installed_version else None
 
     for version, checksum in builds:
-        if is_declared and checksum == current_checksum:
+        if is_declared and same_checksum(checksum, current_checksum):
             continue
 
         label = build_label(version, checksum)
@@ -176,7 +181,7 @@ def collect_rows():
                 installed_text = NO_CHECKSUM
             else:
                 installed_text = column_label(
-                    next((v for v, c in builds if c == checksum), ""), checksum
+                    next((v for v, c in builds if same_checksum(c, checksum)), ""), checksum
                 )
 
             rows.append({
@@ -512,7 +517,7 @@ class KitsPanel:
             if "section" in row or not row["declared"] or not row["latest"]:
                 continue
             latest_checksum = row["latest"][1]
-            if latest_checksum != row["checksum"]:
+            if not same_checksum(latest_checksum, row["checksum"]):
                 selections.append((row["kit"], latest_checksum))
 
         if selections: