feat(zen-pinned-tab-manager): Add pinned tab management functionality

This commit introduces a new feature: pinned tab management. It allows users to pin tabs and define whether to reset pinned tabs on close.

- Adds a new `ZenPinnedTabManager` component to manage pinned tabs.
- Updates `zen-assets.inc.xhtml` and `zen-assets.jar.inc.mn` to include the new component.
- Modifies the `ZenStartup.mjs` file to initialize the new manager.
- Introduces a new preference `zen.pinned-tab-manager.reset-pinned-tab-on-close-shortcut` to control the behavior of pinned tabs on close.
- Updates the settings UI to reflect the new pinned tab management functionality.
- Refactors related preferences from `zen.tab-unloader.*` to `zen.pinned-tab-manager.*`.

This feature enhances Zen's tab management capabilities by providing users with more control over their pinned tabs.

src/browser/components/preferences/zen-settings.js

@@ -1021,7 +1021,7 @@ Preferences.addAll([
     default: false,
   },
   {
-    id: 'zen.tab-unloader.reset-pinned-tab-on-close-shortcut',
+    id: 'zen.pinned-tab-manager.reset-pinned-tab-on-close-shortcut',
     type: 'bool',
     default: true,
   },

src/browser/components/preferences/zenTabsManagement.inc.xhtml

@@ -48,9 +48,6 @@
             data-l10n-id="zen-tabs-unloader-enabled"
             preference="zen.tab-unloader.enabled"/>
 
-      <checkbox id="zenPinnedTabResetOnCloseShortcutEnable"
-                data-l10n-id="zen-tabs-pinned-reset-close-shortcut-enabled"
-                preference="zen.tab-unloader.reset-pinned-tab-on-close-shortcut"/>
 
       <label><html:h2 data-l10n-id="zen-tabs-unloader-unload-delay"/></label>
       <hbox id="zenTabsUnloadDelayContainer">
@@ -63,6 +60,22 @@
       </hbox>
 </groupbox>
 
+<hbox id="zenPinnedTabsManagerCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="paneZenTabManagement">
+      <html:h1 data-l10n-id="pane-zen-pinned-tab-manager-title"/>
+</hbox>
+
+<groupbox id="zenPinnedTabsManagerGroup" data-category="paneZenTabManagement" hidden="true" class="highlighting-group">
+      <label><html:h2 data-l10n-id="zen-pinned-tab-manager-header"/></label>
+      <description class="description-deemphasized" data-l10n-id="zen-pinned-tab-manager-description" />
+
+      <checkbox id="zenPinnedTabResetOnCloseShortcutEnable"
+                data-l10n-id="zen-pinned-tab-manager-reset-close-shortcut-enabled"
+                preference="zen.pinned-tab-manager.reset-pinned-tab-on-close-shortcut"/>
+</groupbox>
+
 </html:template>