feat(desktop): add redis gui foundation baseline

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

plans/2026-03-27-desktop-live-bridge.md

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+# Desktop Live Bridge Plan
+
+Date: 2026-03-27
+Owner: Senior Frontend Engineer
+Related issues: HAC-9, HAC-11
+
+## Goal
+
+Move the visible desktop shell from pure mock interaction to partial real integration by consuming the existing Tauri connection-test and command-execution commands without changing backend scope.
+
+## Scope Delivered
+
+1. Wire the connection test action to `test_redis_connection` in Tauri desktop mode.
+2. Wire the command tray to `execute_redis_command` in Tauri desktop mode.
+3. Keep browser-only `npm run desktop:dev` explicit about demo fallback so PM, CTO, and QA do not mistake it for live Redis behavior.
+4. Update shared docs so run paths and acceptance language distinguish shell review from desktop integration review.
+
+## Constraints
+
+- Do not add or alter Rust command contracts.
+- Do not present browser-shell fallback as live Redis evidence.
+- Keep key browsing, editing, and destructive actions inside current shell scope until backend feature contracts are ready.
+
+## Exit Criteria
+
+- `npm run desktop:build` succeeds after the bridge work.
+- The UI labels command history as live or demo.
+- Tauri desktop mode can attempt a real connection test and command execution through existing commands.