refactor: Extract duplicated perspective selector into Svelte 5 snippet

[Copilot]

The perspective selector UI was duplicated between the small screen options menu and large screen standalone dropdown, requiring changes in two places.

Changes

• Extracted reusable snippet: Created perspectiveSelectorContent() containing the shared DropdownHeader, DropdownSearch, and participant list UI
• Replaced both instances: Small screen menu (lines 657-691) and large screen dropdown (lines 757-789) now render the same snippet
• Net reduction: 33 lines removed

{#snippet perspectiveSelectorContent()}
  <DropdownHeader title={m.perspective_view_as()} />
  <DropdownSearch bind:value={perspectiveSearchQuery} ... />
  <DropdownList>
    <!-- participant list items -->
  </DropdownList>
{/snippet}

<!-- Used in both small and large screen layouts -->
{@render perspectiveSelectorContent()}

This ensures both menus stay in sync and changes only need to be made once.

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