fix(compareBar): disable Compare while the chat is busy

[Haroenv]

Summary

Stacked on #7305.

The compareBar Compare button stayed enabled while the chat was busy (submitted/streaming). Clicking it opened the chat but did not send the comparison, so the click looked like it did nothing. Every other chat entry point already disables its button while the chat is busy.

Result

• connectCompare exposes isChatBusy in its render state, computed like connectPromptSuggestions (busy when the chat has no sendMessage or is submitting/streaming), using the shared getChatRenderState lookup. It is false when no chat is found. canCompare still only means the selection is big enough.
• The shared CompareBar UI component takes an optional isChatBusy prop; the Compare button is disabled={!canCompare || isChatBusy}.
• The JS compareBar widget and the React <CompareBar> pass isChatBusy through. The button re-enables when the chat status returns to ready.
• Tests: connector tests for isChatBusy following the chat status, and a CompareBar UI component test for the disabled/enabled button.

🤖 Generated with Claude Code

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 4 complexity

Metric	Results
Complexity	4

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_{TIP This summary will be updated as you push new changes.}

[pkg-pr-new]

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commit: 845eacd

[github-actions]

Size Change: +212 B (+0.02%)

Total Size: 1.04 MB

📦 View Changed

Filename	Size	Change
packages/instantsearch.js/dist/instantsearch.development.js	334 kB	+120 B (+0.04%)
packages/instantsearch.js/dist/instantsearch.production.min.js	152 kB	+34 B (+0.02%)
packages/react-instantsearch-core/dist/umd/ReactInstantSearchCore.min.js	73.9 kB	+22 B (+0.03%)
packages/react-instantsearch/dist/umd/ReactInstantSearch.min.js	126 kB	+36 B (+0.03%)

ℹ️ View Unchanged

Filename	Size	Change
packages/algoliasearch-helper/dist/algoliasearch.helper.js	44.5 kB	0 B
packages/algoliasearch-helper/dist/algoliasearch.helper.min.js	14.1 kB	-1 B (-0.01%)
packages/instantsearch.css/components/ai-mode-button.css	1.76 kB	0 B
packages/instantsearch.css/components/autocomplete-min.css	4.33 kB	0 B
packages/instantsearch.css/components/autocomplete.css	4.68 kB	0 B
packages/instantsearch.css/components/button.css	1.98 kB	0 B
packages/instantsearch.css/components/chat-min.css	7.4 kB	0 B
packages/instantsearch.css/components/chat.css	7.91 kB	0 B
packages/instantsearch.css/components/filter-suggestions.css	1.89 kB	0 B
packages/instantsearch.css/themes/algolia-min.css	11.9 kB	0 B
packages/instantsearch.css/themes/algolia.css	12.6 kB	0 B
packages/instantsearch.css/themes/nova-min.css	12 kB	0 B
packages/instantsearch.css/themes/nova.css	12.8 kB	0 B
packages/instantsearch.css/themes/reset-min.css	1.3 kB	0 B
packages/instantsearch.css/themes/reset.css	1.38 kB	0 B
packages/instantsearch.css/themes/satellite-min.css	12.8 kB	0 B
packages/instantsearch.css/themes/satellite.css	13.7 kB	0 B
packages/vue-instantsearch/vue2/cjs/index.js	19.9 kB	0 B
packages/vue-instantsearch/vue2/umd/index.js	74.3 kB	-4 B (-0.01%)
packages/vue-instantsearch/vue3/cjs/index.js	20.6 kB	0 B
packages/vue-instantsearch/vue3/umd/index.js	74.7 kB	-6 B (-0.01%)

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