feat(epics): overlay left menu labels with persistent icon rail

[webguru-hypha]

Summary

• Update the space left menu to use a two-layer navigation: a persistent icon rail plus a slide-over label menu.
• Keep Signals/Proposals/Members/Treasury icons always visible so users maintain context even when labels are hidden.
• Match the requested v0 interaction style while preserving existing routing and active-state behavior.

Test plan

• Open a space route and verify the left AI panel shows icons at all times.
• Toggle the menu to expanded state and confirm labels slide in as an overlay.
• Toggle back to icon mode and confirm only the icon rail remains interactive.
• Navigate through Signals, Proposals, Members, and Treasury from both rail and overlay.
• Verify keyboard focus and aria labels on toggle/buttons still work.

Made with Cursor

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 4f728731-f0c4-4a26-9aeb-2ea5d67c40df

📥 Commits

Reviewing files that changed from the base of the PR and between 2e7b2b4 and 4116e32.

📒 Files selected for processing (16)

• apps/web/src/app/[lang]/dho/[id]/@tab/layout.tsx
• apps/web/src/app/layout.tsx
• docs/requirements/ai-left-panel-spec.md
• packages/epics/src/coherence/components/coherence-block.tsx
• packages/epics/src/coherence/components/signal-card.tsx
• packages/epics/src/coherence/components/signal-grid.container.tsx
• packages/epics/src/coherence/components/signal-grid.tsx
• packages/epics/src/coherence/components/signal-section.tsx
• packages/epics/src/common/ai-panel/ai-panel-header.tsx
• packages/epics/src/common/human-chat-panel-context.tsx
• packages/epics/src/common/index.ts
• packages/epics/src/common/panel-wrap-layout.tsx
• packages/epics/src/common/space-left-menu-panel.tsx
• packages/epics/src/common/space-left-panel.tsx
• packages/i18n/src/messages/de.json
• packages/i18n/src/messages/en.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/ai-left-panel-menu-overlay

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