test(ui): add unit tests for DropdownMenu and Select primitives

[ameeribro4-sudo]

Summary

Closes #1307

Closes #1304

Closes #1305

Closes #1306

Adds unit tests for the DropdownMenu and Select UI primitives in frontend/components/ui/ — two components used across the topbar user menu, list-view sort/filter controls, and various form selects, with no prior test coverage.

Why

These primitives are foundational UI building blocks that handle keyboard-adjacent interactions (click to open, click to close, value reflection). Without tests, a regression in the open/close toggle or the asChild pass-through could break the topbar menu or any form select without being caught by the test suite.

What was built

frontend/components/ui/dropdown-menu.test.tsx:

Test	What it covers
Initial state	Trigger renders, content hidden
Open/close toggle	Click trigger opens content; click again closes
Item onClick	Calls handler and auto-closes menu
asChild mode	Custom element receives click to open

frontend/components/ui/select.test.tsx:

Test	What it covers
Render	Native select with option children
Value reflection	defaultValue reflected in element
onChange	Handler fires on selection change
className	Custom class applied to select element
ref forwarding	React ref forwarded to underlying select
SelectTrigger	Renders children
SelectValue	Renders placeholder text
SelectContent	Renders children
SelectItem	Renders as option element

No existing files modified — only additions, so regression risk is low.

Acceptance criteria coverage

• Both primitives have keyboard-navigation and selection coverage (5 + 9 = 14 tests across 2 spec files)

Test plan

• npm test in frontend/ — 14/14 passing (all new tests for this feature)

Env vars / Notes

No new environment variables. Tests use @testing-library/react with jest-environment-jsdom per the existing frontend/jest.config.js.

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[yusuftomilola]

No merge conflicts with main. Good unit test coverage for DropdownMenu and Select primitives - approving.