feat(desktop): add redis gui foundation baseline

Co-Authored-By: Paperclip <noreply@paperclip.ing>

plans/2026-03-27-frontend-ui-foundation.md

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+# Frontend UI Foundation Plan
+
+Date: 2026-03-27
+Owner: Senior Frontend Engineer
+Related issues: HAC-8, HAC-9, HAC-10, HAC-11
+
+## Goal
+
+Move `apps/desktop` from a placeholder shell to a visible React workspace that downstream product, backend, and QA work can inspect.
+
+## Scope Delivered
+
+1. React and Tailwind baseline inside `apps/desktop`.
+2. Visible desktop workspace with connection library, DB switcher, key browser, inspector, and command tray.
+3. Mock interaction for string edits, command history, and destructive confirmation.
+4. Shared UI baseline and QA-facing acceptance notes in project docs.
+
+## Constraints
+
+- Do not expand backend contract beyond the existing `backend_bootstrap` surface.
+- Do not imply real Redis persistence; mock interactions must stay clearly marked.
+- Keep the UI shaped for long-session operator work rather than generic dashboard styling.
+
+## Exit Criteria
+
+- `npm run desktop:build` succeeds.
+- The shell is visually inspectable by PM, CTO, and QA.
+- Shared docs explain scope, run path, and acceptance checks.