docs(thermidor): add button to go back to conversation from search results in UX-aligned demo

[fbeaudoincoveo]

https://coveord.atlassian.net/browse/KIT-5923

While this is not in the UX mockup, it will be quite convenient.

Might go in the end, but good addition for now.

This PR also fixes a few small bugs I found while testing.

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[Copilot]

Pull request overview

Adds bidirectional navigation UX improvements to the Thermidor demo React app by introducing a “Back to conversation” affordance on the search results page and restructuring view rendering to better preserve state across transitions.

Changes:

• Add a “Back to conversation” button to the search results header and wire it through AppShell.
• Rework AppShell rendering to keep the search view mounted (hidden/shown via panels) to preserve search state while navigating.
• Sync PromptInput internal value when initialValue changes, and align header layout sizing/styles across views.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
samples/thermidor/demo-react/src/index.css	Introduces shared layout variable (--header-height) and new view panel classes for preserving mounted views.
samples/thermidor/demo-react/src/components/SearchResultsPage/SearchResultsPage.tsx	Adds onBackToConversation prop + renders the new back button.
samples/thermidor/demo-react/src/components/SearchResultsPage/SearchResultsPage.test.tsx	Adds unit coverage for the back button behavior.
samples/thermidor/demo-react/src/components/SearchResultsPage/SearchResultsPage.module.css	Updates header layout to accommodate the back button and shared header sizing.
samples/thermidor/demo-react/src/components/PromptInput/PromptInput.tsx	Syncs internal textarea state when initialValue changes (important for view transitions).
samples/thermidor/demo-react/src/components/ConversationPage/ConversationPage.module.css	Aligns conversation header height with the new shared header sizing.
samples/thermidor/demo-react/src/components/AppShell.tsx	Wires navigation + persists search view/interface across transitions; adds handler for back-to-conversation.
samples/thermidor/demo-react/src/components/AppShell.bidirectional.test.tsx	Adds an end-to-end style unit test suite for bidirectional navigation and persistence behaviors.

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commit: c1d831b

[chromatic-com]

Important

UI Tests need review – Review now

🟡 UI Tests: 1 visual and accessibility change must be accepted as baseline
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Storybook Publish: 465 stories published

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🔗 Scratch Orgs ready to test this PR:

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[louis-bompart]

lgtm, css could benefits from some 🧹 eventually

The base branch was changed.

[lavoiesl]

All demo code, not production code. Approving to unblock progress.