Refactor common UI components

[allanlasser]

Ahead of #775, I am trying to clean up and consolidate any common UI components used in src/lib but still living in src/common.

• Moves src/common/Dropdown2.svelte to src/lib/components/common/Dropdown.svelte
• Moves Menu, MenuItem, and MenuInsert from src/common to src/lib/components/common
• Removes MenuTitle and replaces with SidebarItem where used
• Refactors dropdowns to use Floating UI for positioning.

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	22.37%	7022 / 31386
🔵	Statements	22.37%	7022 / 31386
🔵	Functions	39.94%	145 / 363
🔵	Branches	57.82%	373 / 645

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
src/lib/components/accounts/UserMenu.svelte	100%	75%	0%	100%
src/lib/components/common/Dropdown.svelte	100%	40%	100%	100%
src/lib/components/forms/BulkActions.svelte	0%	0%	0%	0%	1-126
src/lib/components/layouts/DocumentBrowser.svelte	0%	0%	0%	0%	1-2232
src/lib/components/layouts/Navigation.svelte	0%	0%	0%	0%	1-1853
src/lib/components/navigation/HelpMenu.svelte	0%	0%	0%	0%	1-96
src/lib/components/navigation/LanguageMenu.svelte	0%	0%	0%	0%	1-73
src/lib/components/navigation/OrgMenu.svelte	0%	0%	0%	0%	1-296
src/lib/components/viewer/PDFPage.svelte	0%	0%	0%	0%	1-540
src/lib/components/viewer/toolbars/PaginationToolbar.svelte	0%	0%	0%	0%	1-1831
src/lib/components/viewer/toolbars/ReadingToolbar.svelte	0%	0%	0%	0%	1-152

Generated in workflow #577 for commit 6943582 by the Vitest Coverage Report Action