DX-1128: localise interactive components (SegmentedControl, TabMenu)

[jamiehenson]

Part of DX-1128. Localises the interactive components.

What

src/components/ui/SegmentedControl.tsx + TabMenu.tsx, vendored and rewired to local Icon/cn (es-toolkit direct dep). SegmentedControl's leftIcon/rightIcon props now take a ReactNode (a Heroicon or Ably <Icon> glyph passed directly, sized by the control).

Behaviour

No visual change intended.

Stack (DX-1128)

	PR	Role
	#3409	Design foundation — vendor @ably/ui tokens + reset/core CSS (merged)
	#3410	Local cn + heights utils
	#3411	Docs-native Icon component (Ably glyphs only; Heroicons imported directly)
	#3412	Presentational components (Badge, Button, LinkButton, FeaturedLink, Status)
▶	#3413	Interactive components (SegmentedControl, TabMenu)
	#3414	ProductTile + product data (leaf)
	#3415	syntax-highlighter util + registry
	#3416	Code + CodeSnippet — completes the lift; prunes dead CSS + drops @ably/ui Tailwind scan

#3410–#3416 are a linear stack, each building on the previous; #3409 has merged to main. ▶ = this PR.

Testing

• Load the review app.
• Check a sufficient sample of pages load with no visual regressions.

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dx-1128/docs-components-interactive

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