feat: add Ask AI CE stubs and shared file wiring (#41692)

## Summary
- Adds minimal CE stub files and EE re-export shims so the Ask AI
feature (implemented entirely in the EE repo) can integrate with shared
files
- Updates existing CE stub signatures (`trigger.tsx`, `GPT/index.tsx`)
to match the new API surface expected by shared files
- Adds 9 new AI action type constants to `ReduxActionConstants.tsx`
- Updates shared files (`CodeEditor`, `DynamicTextField`, IDE layouts)
with the imports and conditional rendering hooks for Ask AI

## What this PR does NOT do
This PR does **not** add any AI functionality to the community edition.
All CE stubs return `null`, `false`, or `[]`. The actual Ask AI
implementation lives entirely in the EE repo and will be enabled via the
`license_ask_ai_config_enabled` feature flag.

## Changes

### New CE stub files (all return null/false)
- `ce/selectors/aiAssistantSelectors.ts`
- `ce/actions/aiAssistantActions.ts`
- `ce/components/editorComponents/GPT/AISidePanel.tsx`
- `ce/components/editorComponents/GlobalAISidePanel/index.tsx`

### New EE re-export shims
- `ee/selectors/aiAssistantSelectors.ts`
- `ee/actions/aiAssistantActions.ts`
- `ee/components/editorComponents/GPT/AISidePanel.tsx`
- `ee/components/editorComponents/GlobalAISidePanel/index.tsx`

### Updated existing CE files
- `GPT/trigger.tsx` — added `isAISupportedMode()` export and `hasApiKey`
parameter to `isAIEnabled()`
- `GPT/index.tsx` — re-exports `AISidePanel`
- `ReduxActionConstants.tsx` — 9 new AI action type constants

### Updated shared files
- `CodeEditor/index.tsx` — AI selector/action imports, AI settings
loading in `componentDidMount`
- `CodeEditor/generateQuickCommands.tsx` — slash command updates
- `DynamicTextField.tsx` — `AIAssisted` auto-detection for editor modes
- `StaticLayout.tsx`, `AnimatedLayout.tsx` — render `<GlobalAISidePanel
/>`

## Test plan
- [ ] CE build compiles without errors
- [ ] No AI UI appears in CE (all stubs return null/false)
- [ ] Existing CodeEditor functionality is unaffected
- [ ] Shared files resolve `ee/` imports correctly through the re-export
shims

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
  * Global AI assistant side panel added to IDE layouts
  * AI settings and API key management added
  * Editors can open the AI panel with contextual editor information

* **UI**
  * "Ask AI" command/button removed from beta state
* AI trigger/button now shown only when AI is enabled and opens panel
with context when available
<!-- end of auto-generated comment: release notes by coderabbit.ai -->


## Automation

/ok-to-test tags="@tag.All"

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> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
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> Commit: 73dce4d8ee415b849656be32016aafbf1ef1edf0
> <a
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> Spec:
> <hr>Thu, 16 Apr 2026 09:39:26 UTC
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