fix(windows): warning icon when pinned on taskbar on windows

Two separate Windows-specific fixes:

  1. Taskbar Warning Icon Fix:
     - Issue: Yellow warning triangle on pinned taskbar icon
     - Root cause: BrowserWindowPropertyManager::UpdateWindowProperties()
       sets PKEY_AppUserModel_RelaunchCommand/RelaunchIconResource only when
       shortcut_manager is non-null AND kProfileIconVersion pref exists.
       If either condition fails, relaunch properties are empty, causing
       Windows to show a warning overlay due to app identity mismatch.
     - Fix: Added fallback else branch that uses exe path directly as icon
       source and relaunch command. Ensures relaunch properties are never
       empty for normal browser windows.

  2. VisualElements Branding Fix:
     - Issue: Start Menu tiles referenced chrome.VisualElementsManifest.xml
     - Fix: Created browseros.VisualElementsManifest.xml and updated
       BUILD.gn to reference it.

packages/browseros/chromium_patches/chrome/BUILD.gn

@@ -1,5 +1,5 @@
 diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
-index 97f843f8133c4..0acbe29f11806 100644
+index 97f843f8133c4..7846f837e754d 100644
 --- a/chrome/BUILD.gn
 +++ b/chrome/BUILD.gn
 @@ -18,6 +18,7 @@ import("//build/config/win/manifest.gni")
@@ -37,3 +37,12 @@ index 97f843f8133c4..0acbe29f11806 100644
      configs += [ ":chrome_dll_symbol_order" ]
      if (!is_component_build && !using_sanitizer) {
        configs += [ ":chrome_dll_symbol_exports" ]
+@@ -1492,7 +1499,7 @@ copy("visual_elements_resources") {
+   sources = [
+     "//chrome/app/theme/$branding_path_component/win/tiles/Logo.png",
+     "//chrome/app/theme/$branding_path_component/win/tiles/SmallLogo.png",
+-    "app/visual_elements_resources/chrome.VisualElementsManifest.xml",
++    "app/visual_elements_resources/browseros.VisualElementsManifest.xml",
+   ]
+ 
+   if (is_chrome_branded) {

packages/browseros/chromium_patches/chrome/app/visual_elements_resources/browseros.VisualElementsManifest.xml

@@ -0,0 +1,16 @@
+diff --git a/chrome/app/visual_elements_resources/browseros.VisualElementsManifest.xml b/chrome/app/visual_elements_resources/browseros.VisualElementsManifest.xml
+new file mode 100644
+index 0000000000000..a7bb10b4056e2
+--- /dev/null
++++ b/chrome/app/visual_elements_resources/browseros.VisualElementsManifest.xml
+@@ -0,0 +1,10 @@
++<!-- This is only meant to be copied by chrome.exe in developer builds. -->
++<Application xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
++  <VisualElements
++    BackgroundColor="#212121"
++    ShowNameOnSquare150x150Logo="on"
++    ForegroundText="light"
++    Square150x150Logo="Logo.png"
++    Square70x70Logo="SmallLogo.png"
++    Square44x44Logo="SmallLogo.png"/>
++</Application>

packages/browseros/chromium_patches/chrome/browser/ui/views/frame/browser_window_property_manager_win.cc

@@ -0,0 +1,37 @@
+diff --git a/chrome/browser/ui/views/frame/browser_window_property_manager_win.cc b/chrome/browser/ui/views/frame/browser_window_property_manager_win.cc
+index 1a62480aee22c..2b678add30238 100644
+--- a/chrome/browser/ui/views/frame/browser_window_property_manager_win.cc
++++ b/chrome/browser/ui/views/frame/browser_window_property_manager_win.cc
+@@ -6,6 +6,7 @@
+ 
+ #include "base/command_line.h"
+ #include "base/functional/bind.h"
++#include "base/path_service.h"
+ #include "base/strings/utf_string_conversions.h"
+ #include "base/win/windows_version.h"
+ #include "chrome/browser/browser_process.h"
+@@ -17,6 +18,7 @@
+ #include "chrome/browser/web_applications/extensions/web_app_extension_shortcut.h"
+ #include "chrome/browser/web_applications/web_app_helpers.h"
+ #include "chrome/common/pref_names.h"
++#include "chrome/installer/util/install_util.h"
+ #include "components/prefs/pref_service.h"
+ #include "extensions/browser/extension_registry.h"
+ #include "ui/base/win/shell.h"
+@@ -87,6 +89,16 @@ void BrowserWindowPropertyManager::UpdateWindowProperties() {
+     shortcut_manager->GetShortcutProperties(profile->GetPath(), &command_line,
+                                             &pinned_name, &icon_path);
+     command_line_string = command_line.GetCommandLineString();
++  } else if (browser->is_type_normal() || browser->is_type_popup()) {
++    // Fallback: Set basic relaunch details using the current executable.
++    // This ensures taskbar pinning works correctly even when the profile
++    // icon hasn't been created yet (e.g., in developer builds).
++    base::FilePath exe_path;
++    if (base::PathService::Get(base::FILE_EXE, &exe_path)) {
++      icon_path = exe_path;
++      command_line_string = L"\"" + exe_path.value() + L"\"";
++      pinned_name = InstallUtil::GetDisplayName();
++    }
+   }
+   ui::win::SetAppDetailsForWindow(app_id, icon_path, 0, command_line_string,
+                                   pinned_name, hwnd_);