feat(desktop): add redis gui foundation baseline

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

docs/qa/local-desktop-smoke.md

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+# Local Desktop Build And Smoke Runbook
+
+Date: 2026-03-27
+Owner: Senior Backend Engineer
+
+## Goal
+
+Provide one repeatable local build and smoke path that any engineer or QA can run against a seeded Redis fixture.
+
+## Prerequisites
+
+- Rust 1.85+
+- Node.js 24+
+- `pnpm` 10+
+- Docker CLI with permission to run containers
+- Linux desktop build prerequisites for Tauri, including WebKitGTK and GTK3 development packages
+
+## Standard Commands
+
+```bash
+pnpm install
+cargo test -p redis-core
+pnpm run desktop:build
+pnpm run desktop:tauri:build
+```
+
+Expected package output path on Linux after a successful Tauri build:
+
+```text
+target/release/bundle/
+```
+
+Linux preflight checks for native desktop libraries:
+
+```bash
+pkg-config --modversion gtk+-3.0
+pkg-config --modversion webkit2gtk-4.1
+pkg-config --modversion libsoup-3.0
+```
+
+All three commands should return a version. If any of them fail, `pnpm run desktop:tauri:build` is still environment-blocked even if the repository scripts are correct.
+
+## Local Redis Fixture
+
+Start and seed a deterministic Redis instance on `127.0.0.1:6380`:
+
+```bash
+./scripts/redis-fixture/start.sh
+./scripts/redis-fixture/seed.sh
+```
+
+Stop and remove the fixture:
+
+```bash
+./scripts/redis-fixture/stop.sh
+```
+
+Seeded keys:
+
+- `smoke:string`
+- `smoke:string:ttl`
+- `smoke:hash`
+- `smoke:list`
+- `smoke:set`
+- `smoke:zset`
+- `smoke:stream`
+
+## Linux Smoke Steps
+
+1. Run `./scripts/redis-fixture/start.sh`.
+2. Run `./scripts/redis-fixture/seed.sh`.
+3. Launch `pnpm run desktop:tauri:dev`.
+4. In the desktop app, connect to host `127.0.0.1`, port `6380`, database `0`, no password, TLS disabled.
+5. Verify the desktop window opens, app version plus runtime mode are visible in the header, and the connection test succeeds.
+6. Verify the command console can run a safe read, such as `PING` or `GET smoke:string`.
+7. Verify the seeded keys appear with expected types and TTL state in the browser and inspector surfaces.
+8. Change TTL on `smoke:string:ttl`, remove TTL from the same key, and confirm the updated TTL state is reflected in the inspector.
+9. Capture screenshots or terminal output for build, launch, connection success, key browse, TTL update, and command execution. If screenshots are unavailable, copy the in-app QA snapshot text into the smoke log.
+10. Run `./scripts/redis-fixture/stop.sh` after the session.
+
+## Current Validation Boundary
+
+- `cargo test -p redis-core` passes in the current workspace.
+- `pnpm run desktop:build` passes in the current workspace.
+- `./scripts/redis-fixture/start.sh`, `./scripts/redis-fixture/seed.sh`, and `./scripts/redis-fixture/stop.sh` pass in the current workspace.
+- `pnpm run desktop:tauri:build` now produces Linux `.deb` and `.rpm` artifacts under `target/release/bundle/`.
+- The same Tauri build still fails in its AppImage stage with `io: Connection reset by peer (os error 104)`, so AppImage should be treated as not yet verified.