fix: automated bug fixes (bare except, encoding, security, robustness)

Fixes from automated bug-hunting campaign:
- bare except -> specific exceptions
- encoding fixes (utf-8)
- security fixes (injection, path traversal)
- robustness improvements (None checks, file handles)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: lukisch

README/screenshots/main.png

@@ -71,7 +71,7 @@ def _build_menu(self):
         file_menu.add_separator()
         file_menu.add_command(label="Als CSV exportieren…", command=self.export_csv, accelerator="Ctrl+E")
         file_menu.add_separator()
-        file_menu.add_command(label="Beenden", command=self.destroy, accelerator="Ctrl+Q")
+        file_menu.add_command(label="Beenden", command=self._on_close, accelerator="Ctrl+Q")
         menubar.add_cascade(label="Datei", menu=file_menu)
 
         # Bearbeiten-Menü
@@ -98,7 +98,7 @@ def _build_menu(self):
 
         # Shortcuts
         self.bind_all("<Control-o>", lambda e: self.open_db())
-        self.bind_all("<Control-q>", lambda e: self.destroy())
+        self.bind_all("<Control-q>", lambda e: self._on_close())
         self.bind_all("<Control-e>", lambda e: self.export_csv())
         self.bind_all("<Control-f>", lambda e: self._focus_search())
         self.bind_all("<Control-a>", lambda e: self._select_all())
@@ -306,7 +306,7 @@ def close_db(self):
         if self.conn is not None:
             try:
                 self.conn.close()
-            except Exception:
+            except sqlite3.Error:
                 pass
             self.conn = None
             self.db_path = None

SQLiteViewer.py

@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+         xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+         xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
+         xmlns:desktop="http://schemas.microsoft.com/appx/manifest/desktop/windows10"
+         IgnorableNamespaces="uap rescap desktop">
+
+  <Identity Name="Geiger.SQLiteViewer"
+            Publisher="CN=52596601-BAB4-4F3F-B182-E8F3F273B202"
+            Version="1.0.0.0"
+            ProcessorArchitecture="x64" />
+
+  <Properties>
+    <DisplayName>SQLiteViewer</DisplayName>
+    <PublisherDisplayName>Geiger</PublisherDisplayName>
+    <Logo>icons\Square150x150Logo.png</Logo>
+    <Description>Leichtgewichtiger SQLite-Datenbank-Browser mit GUI. Tabellen anzeigen, SQL-Abfragen, Export.</Description>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Desktop"
+                        MinVersion="10.0.17763.0"
+                        MaxVersionTested="10.0.26100.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="en-us" />
+    <Resource Language="de-de" />
+  </Resources>
+
+  <Applications>
+    <Application Id="SQLiteViewer"
+                 Executable="SQLiteViewer.exe"
+                 EntryPoint="Windows.FullTrustApplication">
+
+      <uap:VisualElements DisplayName="SQLiteViewer"
+                          Description="Leichtgewichtiger SQLite-Datenbank-Browser mit GUI. Tabellen anzeigen, SQL-Abfragen, Export."
+                          BackgroundColor="transparent"
+                          Square150x150Logo="icons\Square150x150Logo.png"
+                          Square44x44Logo="icons\Square44x44Logo.png">
+        <uap:DefaultTile Wide310x150Logo="icons\Wide310x150Logo.png"
+                         Square310x310Logo="icons\Square310x310Logo.png" />
+      </uap:VisualElements>
+
+    </Application>
+  </Applications>
+
+  <Capabilities>
+    <Capability Name="internetClient" />
+    <rescap:Capability Name="runFullTrust" />
+  </Capabilities>
+
+</Package>

_WARTUNG/msix_staging/AppxManifest.xml

@@ -1,14 +1,14 @@
 {
   "app_name": "SQLiteViewer",
-  "publisher": "CN=LukasGeiger",
-  "publisher_display": "Lukas Geiger",
-  "identity_name": "LukasGeiger.SQLiteViewer",
+  "publisher": "CN=52596601-BAB4-4F3F-B182-E8F3F273B202",
+  "publisher_display": "Geiger",
+  "identity_name": "Geiger.SQLiteViewer",
   "version": "1.0.0.0",
   "description": "Leichtgewichtiger SQLite-Datenbank-Browser mit GUI. Tabellen anzeigen, SQL-Abfragen, Export.",
   "executable": "SQLiteViewer.exe",
-  "capabilities": "internetClient",
+  "capabilities": "internetClient,runFullTrust",
   "category": "Developer Tools",
   "age_rating": "3+",
-  "privacy_url": "https://github.com/lukisch/SQLiteViewer",
-  "support_url": "https://github.com/lukisch/SQLiteViewer/issues"
-}
+  "privacy_url": "https://github.com/file-bricks/SQLiteViewer/blob/master/PRIVACY_POLICY.md",
+  "support_url": "https://github.com/file-bricks/SQLiteViewer/issues"
+}