itemactions: Add context menu actions to hide and unhide files using .hidden

Summary:
This patch introduces context menu actions that allow users to hide or unhide selected files by editing the .hidden file in their parent directories.

What this patch does:
- Implemented HideFileItemAction plugin based on KAbstractFileItemActionPlugin
- Plugin is disabled by default unless explicitly enabled in kservicemenurc via the hidefileitemaction key
- "Hide" action adds selected file names to the .hidden file, avoiding duplicates
- "Unhide" action removes selected file names from the .hidden file
- Action visibility logic:
	- If only visible or only hidden files are selected, only the relevant action is shown
	- If both are selected, both "Hide" and "Unhide" actions are shown
- Write permission checks ensure actions are disabled if the .hidden file cannot be modified
- Optimized redundant path computations by calculating parent directory and .hidden file paths once and reusing them

1 files changed, 4 insertions, 1 deletions

diff --git a/src/settings/contextmenu/contextmenusettingspage.cpp b/src/settings/contextmenu/contextmenusettingspage.cpp
index b3585e3fa..ae3b58033 100644
--- a/src/settings/contextmenu/contextmenusettingspage.cpp
+++ b/src/settings/contextmenu/contextmenusettingspage.cpp
@@ -300,7 +300,10 @@ void ContextMenuSettingsPage::loadServices()
     for (const auto &jsonMetadata : jsonPlugins) {
         const QString desktopEntryName = jsonMetadata.pluginId();
         if (!isInServicesList(desktopEntryName)) {
-            const bool checked = showGroup.readEntry(desktopEntryName, true);
+            bool checked = showGroup.readEntry(desktopEntryName, true);
+            if (!showGroup.hasKey(desktopEntryName) && desktopEntryName == QStringLiteral("hidefileitemaction")) {
+                checked = false;
+            }
             addRow(jsonMetadata.iconName(), jsonMetadata.name(), desktopEntryName, checked);
         }
     }