[codex] Deduplicate connection failure messaging

[juliusmarminge]

Connection failures currently repeat the same supervisor error in the composer banner title, banner body, and disabled composer placeholder. This makes the failure state noisy and makes the actual reason harder to scan.

The banner title used connectionStatusText, which intentionally includes the latest low-level reason, while the banner description also rendered that reason. The composer independently reused the same combined status string as its placeholder.

This change adds a concise connection-status title presentation, keeps the underlying failure reason in the banner description, and leaves the normal composer placeholder unchanged while sending remains unavailable.

Verification:

• vp lint --report-unused-disable-directives on the changed files
• client-runtime and web typechecks
• focused connection presentation tests (8 passing)

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Note

Low Risk
Presentation-only changes to connection messaging in the web UI; no changes to connection logic or send gating beyond placeholder copy.

Overview
Connection failure copy was repeated in the composer banner title, banner body, and disabled composer placeholder. This PR adds connectionStatusTitle in client-runtime so titles stay short (e.g. reconnecting omits the Reason: … line that connectionStatusText still includes).

ChatView uses the new helper for the environment-unavailable banner title while the description still shows connection.error. ChatComposer no longer injects connection status into the textarea placeholder when the environment is down—it uses the usual placeholders instead.

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Note

Deduplicate connection failure messaging in chat banner and composer

• Introduces connectionStatusTitle in presentation.ts, which returns a concise title (e.g. Failed to connect. Reconnecting...) that suppresses error details, delegating to connectionStatusText with error forced to null otherwise.
• Updates the system composer banner in ChatView.tsx to use connectionStatusTitle instead of connectionStatusText, removing the redundant error reason from the banner title.
• Removes the environmentUnavailable placeholder branch from ChatComposer.tsx, so the composer no longer shows connection status text in the textarea placeholder when the environment is unavailable.

^{Macroscope summarized 221377f.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds a helper function for shorter connection status titles and removes a redundant placeholder message from the chat composer. The changes are self-contained UI text cleanup with no complex logic or risky side effects.

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