feat(epics): replace DHO tabs with AI left-panel menu

[webguru-hypha]

Summary

• Replace DHO top navigation tabs with AI left-panel menu navigation when AI chat is enabled.
• Add left panel content modes (menu and ai) so the sparkles trigger switches between navigation and assistant chat.
• Implement the menu as a persistent icon rail with a slide-over label panel, keeping icons always visible for orientation.

Test plan

• Open a DHO space with AI chat enabled and confirm top tabs are hidden.
• Verify left panel opens in menu mode and shows Signals/Proposals/Members/Treasury.
• Collapse menu and confirm icons remain visible (no context loss).
• Expand menu and confirm labels overlay in while icon rail remains visible.
• Click each item from icon rail and overlay list; verify active state + routing.
• Switch to AI mode via sparkles trigger and back to menu via panel header control.

Made with Cursor

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: f07106e4-d05c-4adb-812b-a00e1e0be171

📥 Commits

Reviewing files that changed from the base of the PR and between 2e7b2b4 and a58fd00.

📒 Files selected for processing (10)

• apps/web/src/app/[lang]/dho/[id]/@tab/layout.tsx
• apps/web/src/app/layout.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/left-panel-menu-redo

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