Updates: More Modal Modification (#8256)

Refactors modal dialog layouts for improved flexibility and consistency.

**Changes:**
- Add dedicated slot for left panel header title with dynamic
content/icons
- Consolidate side panel rendering within `BaseModalLayout`
- Remove redundant `PanelHeader` and `RightSidePanel` components
- Apply `select-none` to text elements to prevent accidental selection

---------

Co-authored-by: Amp <amp@ampcode.com>

src/components/widget/SampleModelSelector.vue

@@ -117,7 +117,7 @@
     </template>
 
     <template #rightPanel>
-      <RightSidePanel></RightSidePanel>
+      <div class="size-full bg-modal-panel-background pr-6 pb-8 pl-4"></div>
     </template>
   </BaseModalLayout>
 </template>
@@ -136,7 +136,6 @@ import SingleSelect from '@/components/input/SingleSelect.vue'
 import Button from '@/components/ui/button/Button.vue'
 import BaseModalLayout from '@/components/widget/layout/BaseModalLayout.vue'
 import LeftSidePanel from '@/components/widget/panel/LeftSidePanel.vue'
-import RightSidePanel from '@/components/widget/panel/RightSidePanel.vue'
 import type { NavGroupData, NavItemData } from '@/types/navTypes'
 import { OnCloseKey } from '@/types/widgetTypes'
 import { createGridStyle } from '@/utils/gridUtil'