Merged PR 1924: feat(isa-app-shell): improve navigation link targeting for remission sub-routes

feat(isa-app-shell): improve navigation link targeting for remission sub-routes

Replace generic routerLinkActive with specific regex patterns for remission
navigation items to ensure accurate active state highlighting. This change:

- Uses sharedRegexRouterLinkActive for "Remission" sub-item to match specific routes
- Uses sharedRegexRouterLinkActive for "Warenbegleitscheine" sub-item
- Replaces broad routerLinkActive with precise regex patterns
- Ensures navigation accurately reflects current route state for remission workflows

The regex patterns specifically target `/[tabId]/remission/(mandatory|department)`
and `/[tabId]/remission/return-receipt` routes for better user experience.

Ref: #5304

apps/isa-app/src/shared/shell/side-menu/side-menu.component.html

@@ -323,7 +323,8 @@
               'remission',
             ]"
             (isActiveChange)="focusSearchBox()"
-            routerLinkActive="active"
+            sharedRegexRouterLinkActive="active"
+            sharedRegexRouterLinkActiveTest="^\/\d*\/remission\/(mandatory|department)"
           >
             <span class="side-menu-group-item-icon"> </span>
             <span class="side-menu-group-item-label">Remission</span>
@@ -338,7 +339,8 @@
               'return-receipt',
             ]"
             (isActiveChange)="focusSearchBox()"
-            routerLinkActive="active"
+            sharedRegexRouterLinkActive="active"
+            sharedRegexRouterLinkActiveTest="^\/\d*\/remission\/return-receipt"
           >
             <span class="side-menu-group-item-icon"> </span>
             <span class="side-menu-group-item-label">Warenbegleitscheine</span>