feat(desktop): add redis gui foundation baseline

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

plans/2026-03-27-hac-15-desktop-build-smoke.md

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+# HAC-15 Desktop Build, Packaging, And Smoke Plan
+
+Date: 2026-03-27 UTC
+Owner: Senior Backend Engineer
+Issue: HAC-15
+
+## Goal
+
+Make the desktop repository usable through one stable build path, one stable package path, and one repeatable local Redis smoke path.
+
+## Current Findings
+
+- The original `tauri.conf.json` pre-build and pre-dev commands assumed the wrong working directory and caused `tauri build` to fail before the real Rust/Tauri flow began.
+- The repo already had a valid desktop frontend build and a validated shared Rust backend core, but no stable `pnpm` workspace setup for the desktop shell.
+- QA had explicit blockers around missing seed data, missing Docker or smoke automation, and missing reusable build instructions.
+
+## Changes In This Pass
+
+1. Standardize the workspace on `pnpm` by adding `packageManager`, `pnpm-workspace.yaml`, and root desktop scripts.
+2. Fix Tauri `beforeDevCommand` and `beforeBuildCommand` so they execute against the desktop workspace directly.
+3. Add a Docker-backed Redis fixture with start, seed, and stop scripts.
+4. Add a local desktop smoke runbook and refresh README and QA evidence docs around the new commands and fixture path.
+
+## Verification
+
+- Passed: `cargo test -p redis-core`
+- Passed: `pnpm install --lockfile-only`
+- Passed: `pnpm run desktop:build`
+- Passed: `./scripts/redis-fixture/start.sh`
+- Passed: `./scripts/redis-fixture/seed.sh`
+- Passed: `./scripts/redis-fixture/stop.sh`
+- In progress: `pnpm run desktop:tauri:build` now clears the pre-build script failure and reaches Cargo dependency download and compile steps
+
+## Remaining Risk
+
+- This heartbeat has not yet produced a saved unsigned package artifact for Linux, macOS, or Windows.
+- First-run Cargo package downloads remain slow and can serialize on the shared package-cache lock, so package verification should be rerun in a clean single-build window.
+- End-to-end smoke evidence inside the desktop UI still depends on frontend surfaces that are only partially implemented.