feat(extensions): adds chatbot P1-P2

[EnxDev]

SUMMARY

Implements Phase 1 and Phase 2 of the chatbot extension architecture defined in the chatbot SIP.

P1 — Mount point & registration

• Extends ViewContributions manifest schema with an app scope so superset.chatbot can be declared in extension.json
• Adds CHATBOT_LOCATION = 'superset.chatbot' constant and AppViewLocations structure in src/views/contributions.ts
• Adds host-internal getViewProvider(location, id) and getRegisteredViewIds(location) to src/core/views — not exposed on the public @apache-superset/core API, preserving the getViews descriptor-only boundary
• Adds subscribeToLocation for reactive re-resolution when the registry changes
• Adds icon?: string field to the View descriptor (static, set at registerView() time) and a ChatbotView type alias for extension authors
• Adds src/core/chatbot/getActiveChatbot — first-to-register fallback policy
• Adds ChatbotMount component: fixed bottom-right, zIndexPopupBase + 2, host-owned ErrorBoundary, reactive via subscribeToLocation
• Mounts <ChatbotMount /> as a sibling of <Switch> inside ExtensionsStartup so the bubble persists across route changes
• Host-level unhandledrejection isolation in ExtensionsStartup covers extension async failures

P2 — Admin & singleton selection

• Adds ExtensionSettings (singleton row) and ExtensionEnabled (per-extension flag) SQLAlchemy models
• Adds Alembic migration b2c3d4e5f6a7
• Adds GET /api/v1/extensions/settings and PUT /api/v1/extensions/settings endpoints
• ChatbotMount fetches active_chatbot_id on mount and passes it to getActiveChatbot
• ExtensionsList shows a "Default chatbot" Select picker when more than one chatbot is registered

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A — infrastructure only, no visible UI change until a chatbot extension is installed.

TESTING INSTRUCTIONS

1. Install a chatbot extension that calls views.registerView({ id: 'my.chatbot', name: 'My Chatbot' }, 'superset.chatbot', () => <MyBot />)
2. Verify the bubble appears fixed at the bottom-right corner across all routes
3. Install two chatbot extensions; verify only one renders at a time
4. Go to Extensions → set "Default chatbot" → verify the correct one renders
5. Disable a chatbot via the toggle; verify it stops rendering

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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[codecov]

Codecov Report

❌ Patch coverage is 46.80851% with 25 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (chat-prototype@793ffb3). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...uperset-frontend/src/extensions/ExtensionsList.tsx	41.93%	18 Missing ⚠️
...set-frontend/src/components/ChatbotMount/index.tsx	45.45%	6 Missing ⚠️
superset-frontend/src/core/chatbot/index.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

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##             chat-prototype   #40433   +/-   ##
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  Coverage                  ?   67.71%           
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  Lines                     ?    77104           
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Flag	Coverage Δ
javascript	67.27% <46.80%> (?)
python	100.00% <ø> (?)
unit	100.00% <ø> (?)

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