build(psalm): baseline pre-existing Imagick stub and DeprecatedMethod errors

Add 19 pre-existing Psalm errors to the baseline that are not caused by
this branch's encryption fixes:

- 14 Imagick-related UndefinedClass/UndefinedConstant errors in
  apps/theming/lib/IconBuilder.php, apps/theming/lib/ImageManager.php,
  lib/private/Preview/Bitmap.php, lib/private/Preview/HEIC.php, and
  lib/private/Preview/SVG.php. These stem from the imagick.php stub at
  build/stubs/imagick.php missing ImagickPixel, ImagickDraw,
  ImagickException classes and several constants.

- 1 DeprecatedMethod error in tests/lib/TestCase.php for
  SimpleContainer::offsetGet, introduced when that file was added to
  psalm.xml project files by upstream commit a430702.

None of these errors originate from this branch's changes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stephen Cuppett <steve@cuppett.com>

Author: cuppett

build/psalm-baseline.xml

@@ -2442,6 +2442,23 @@
       <code><![CDATA[setUserValue]]></code>
     </DeprecatedMethod>
   </file>
+  <file src="apps/theming/lib/IconBuilder.php">
+    <UndefinedClass>
+      <code><![CDATA[ImagickDraw]]></code>
+      <code><![CDATA[ImagickPixel]]></code>
+      <code><![CDATA[ImagickPixel]]></code>
+      <code><![CDATA[ImagickPixel]]></code>
+      <code><![CDATA[ImagickPixel]]></code>
+      <code><![CDATA[\ImagickException]]></code>
+      <code><![CDATA[\ImagickException]]></code>
+      <code><![CDATA[\ImagickException]]></code>
+    </UndefinedClass>
+    <UndefinedConstant>
+      <code><![CDATA[Imagick::COMPOSITE_ATOP]]></code>
+      <code><![CDATA[Imagick::FILTER_LANCZOS]]></code>
+      <code><![CDATA[Imagick::VIRTUALPIXELMETHOD_TRANSPARENT]]></code>
+    </UndefinedConstant>
+  </file>
   <file src="apps/theming/lib/ImageManager.php">
     <DeprecatedMethod>
       <code><![CDATA[deleteAppValue]]></code>
@@ -2456,6 +2473,12 @@
       <code><![CDATA[setAppValue]]></code>
       <code><![CDATA[setAppValue]]></code>
     </DeprecatedMethod>
+    <UndefinedClass>
+      <code><![CDATA[$e]]></code>
+      <code><![CDATA[$e]]></code>
+      <code><![CDATA[\ImagickException]]></code>
+      <code><![CDATA[\ImagickException]]></code>
+    </UndefinedClass>
   </file>
   <file src="apps/theming/lib/Jobs/RestoreBackgroundImageColor.php">
     <DeprecatedMethod>
@@ -3743,6 +3766,21 @@
       <code><![CDATA[mixed]]></code>
     </LessSpecificImplementedReturnType>
   </file>
+  <file src="lib/private/Preview/Bitmap.php">
+    <UndefinedConstant>
+      <code><![CDATA[imagick::FILTER_LANCZOS]]></code>
+    </UndefinedConstant>
+  </file>
+  <file src="lib/private/Preview/HEIC.php">
+    <UndefinedConstant>
+      <code><![CDATA[\Imagick::FILTER_CATROM]]></code>
+    </UndefinedConstant>
+  </file>
+  <file src="lib/private/Preview/SVG.php">
+    <UndefinedClass>
+      <code><![CDATA[\ImagickPixel]]></code>
+    </UndefinedClass>
+  </file>
   <file src="lib/private/Profile/Actions/FediverseAction.php">
     <NoValue>
       <code><![CDATA[$instance]]></code>
@@ -3956,6 +3994,9 @@
     </DeprecatedMethod>
   </file>
   <file src="tests/lib/TestCase.php">
+    <DeprecatedMethod>
+      <code><![CDATA[$container]]></code>
+    </DeprecatedMethod>
     <InternalMethod>
       <code><![CDATA[lockFile]]></code>
       <code><![CDATA[unlockFile]]></code>