[refactor] Manager dialog simplification (#8041)

## Summary
Simplifies the Manager dialog by consolidating components and using
BaseModalLayout with v-model support for right panel state.

## Changes
- **Consolidation**: Merged ManagerDialogContent, ManagerHeader,
ManagerNavSidebar, RegistrySearchBar, and SearchFilterDropdown into
single ManagerDialog component
- **Right panel**: Added v-model:rightPanelOpen to BaseModalLayout for
external panel state control; clicking a node card now auto-opens the
info panel
- **Cleanup**: Removed unused useResponsiveCollapse composable, TabItem
and SearchOption types
- **UI tweaks**: Moved action buttons (Install All/Update All) from
header-right-area to contentFilter area


[manager-capture.webm](https://github.com/user-attachments/assets/2dd6092a-965d-4885-8ba6-6a2cc51f024a)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8041-refactor-Manager-dialog-simplification-2e86d73d3650815ba699e49a2748b682)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: github-actions <github-actions@github.com>

src/composables/element/useResponsiveCollapse.ts

@@ -1,41 +0,0 @@
-import { breakpointsTailwind, useBreakpoints } from '@vueuse/core'
-import { ref, watch } from 'vue'
-
-type BreakpointKey = keyof typeof breakpointsTailwind
-
-/**
- * Composable for element with responsive collapsed state
- * @param breakpointThreshold - Breakpoint at which the element should become collapsible
- */
-export const useResponsiveCollapse = (
-  breakpointThreshold: BreakpointKey = 'lg'
-) => {
-  const breakpoints = useBreakpoints(breakpointsTailwind)
-
-  const isSmallScreen = breakpoints.smallerOrEqual(breakpointThreshold)
-  const isOpen = ref(!isSmallScreen.value)
-
-  /**
-   * Handles screen size changes to automatically open/close the element
-   * when crossing the breakpoint threshold
-   */
-  const onIsSmallScreenChange = () => {
-    if (isSmallScreen.value && isOpen.value) {
-      isOpen.value = false
-    } else if (!isSmallScreen.value && !isOpen.value) {
-      isOpen.value = true
-    }
-  }
-
-  watch(isSmallScreen, onIsSmallScreenChange)
-
-  return {
-    breakpoints,
-    isOpen,
-    isSmallScreen,
-
-    open: () => (isOpen.value = true),
-    close: () => (isOpen.value = false),
-    toggle: () => (isOpen.value = !isOpen.value)
-  }
-}