Final release cleanup: remove CLI banner & Generate Rule, explicit onboarding/config models, deprecation link

[sestinj]

Summary

Part of the final release of the Continue VS Code extension. This removes deprecated UI/features and converts onboarding/config off Hub uses: slugs to explicit model definitions:

• Remove the CLI-install banner (CliInstallBanner component + test) and its hasDismissedCliInstallBanner localStorage key.
• Remove the "Generate Rule" feature: the ResponseActions button, the GenerateRuleDialog directory, the continue.generateRule VS Code command + menu entry, and the generateRule protocol message.
• Convert onboarding (core/config/onboarding.ts) and the new-assistant template (core/config/createNewAssistantFile.ts) off Hub uses: slugs to explicit model definitions (and drop the mcpServers section from the new-config template).
• Update the deprecation banner export link to https://continue.dev/export.
• Bump the VS Code extension version to 1.3.40.

Test plan

Local equivalents of CI (Node 20.20.1) all pass:

• gui: npm run build (tsc + vite)
• gui: eslint on changed files
• core: npx tsc --noEmit -p .
• extensions/vscode: npx tsc --noEmit -p .
• Prettier --check on changed files
• No dangling references to removed modules

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