feat(escrow,shared,ui): implement multi-sig escrow payout tests, OS-a…

[devchant]

Summary of Changes

This PR addresses issues #327, #333, and #328 by implementing multi-signature threshold logic tests for the Escrow Payout UI, creating an OS-aware theme provider to eliminate Flash of Unstyled Content (FOUC), and adding interaction tests for the global Command Palette navigation.

The Problem Being Solved

1. Escrow Payout Multi-Sig: Needed verification that the Escrow Release UI prevents fund release when multi-signature thresholds are incomplete (e.g. 1 of 2 signatures).
2. OS-Aware Theme Persistence: Needed pre-hydration evaluation of prefers-color-scheme and local storage overrides to eliminate FOUC on page reloads.
3. Global Command Palette: Needed tests verifying Cmd+K keyboard shortcut toggles and real-time search filtering against backend API delivery records.

Implemented Solution

• components/escrow/PayoutUI.test.tsx & __tests__/components/escrow/PayoutUI.test.tsx: Added assertions confirming the submit button has the explicit disabled attribute when thresholds are incomplete (1/2, 0/2, 2/3), and enables only when thresholds are met (2/2, 3/3).
• components/shared/ThemeProvider.tsx: Created ThemeProvider wrapping next-themes and injecting themeService.getThemeScript() prior to React hydration for instant theme application without FOUC.
• __tests__/components/shared/CommandPalette.test.tsx: Implemented keystroke event simulation (Ctrl+K/Cmd+K, Escape) and query filtering tests against commandPaletteService backend API responses.

Files Changed

• __tests__/components/escrow/PayoutUI.test.tsx [NEW]
• components/escrow/__tests__/PayoutUI.test.tsx [MODIFY]
• components/shared/ThemeProvider.tsx [NEW]
• components/shared/index.ts [MODIFY]
• app/providers.tsx [MODIFY]
• __tests__/components/shared/ThemeProvider.test.tsx [NEW]
• __tests__/components/shared/CommandPalette.test.tsx [MODIFY]
• components/ui/__tests__/CommandPalette.test.tsx [MODIFY]

Technical Decisions & Layered Architecture

• Strictly followed Component ➔ Hook ➔ Service pattern across all features.
• Data structures are retrieved via service contracts (escrowService, themeService, commandPaletteService).
• Anti-FOUC implementation runs synchronously prior to DOM paint via head script injection.

Testing Evidence

• All 6 target test suites (40 tests total) passing:
  • ThemeProvider.test.tsx: 4 passed
  • useTheme.test.ts: 4 passed
  • PayoutUI.test.tsx: 13 passed
  • CommandPalette.test.tsx: 19 passed

Closes #327
Closes #333
Closes #328

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