feat(desktop): add typed inspector panels

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

plans/2026-03-28-hac-18-typed-inspector-panels.md

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+# HAC-18 Typed Inspector Panels
+
+Date: 2026-03-28 UTC
+Owner: Senior Frontend Engineer
+Issue: HAC-18
+
+## Goal
+
+Ship one more visible desktop feature slice without waiting on GUI screenshot capture or AppImage validation.
+
+## Selected Scope
+
+- upgrade the inspector for non-string Redis values from raw JSON text to structured read-only panels
+- keep the existing string edit flow, TTL actions, and error notice foundation unchanged
+- stay within the current `read_redis_value` contract and avoid backend expansion
+- add minimum frontend tests around the new structured presentation mapping
+
+## Non-Goals
+
+- no delete execution
+- no backend contract changes
+- no packaging or screenshot evidence work in this heartbeat
+- no full redesign of the existing desktop shell
+
+## Verification Plan
+
+- `pnpm --filter @redis-gui/desktop test`
+- `pnpm run desktop:build`
+
+## Expected User Impact
+
+- operators can scan `hash/list/set/zset/stream` payloads directly in the inspector without mentally parsing raw JSON
+- the read-only boundary for non-string types remains explicit, but the viewing experience becomes materially more usable