🤖 fix: prevent retry banner flicker during auto-retry

[ibetitsmike]

Fixes the bottom Retry banner flickering during auto-retry loops by keeping the RetryBarrier visible until the retry stream produces real output, and suppressing the StreamingBarrier while the retry banner is shown.

• Adds a small predicate in retryEligibility.ts to detect "retry stream started but no tokens yet".
• Updates AIView to use this predicate + persisted retry attempt state.

Validation:

• bun test src/browser/utils/messages/retryEligibility.test.ts
• make static-check

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[chatgpt-codex-connector]

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Reviewed commit: 11a3acccd0

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[ibetitsmike]

@codex review

Addressed the TTFT regression by restoring the !canInterrupt gate for the hasInterruptedStream(...) branch and expanding the retry-sticky predicate to cover the common case where no assistant DisplayedMessage exists until the first delta.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

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