AskAi: add header button to Codex and centralize config per build type

[reakaleek]

What

• Add an Ask AI button to the Codex header and extract shared flyout logic into a reusable hook
• Introduce a centralized config that controls AI provider defaults and suggestions per build type (Codex vs Assembler)

Why

• Codex needs its own Ask AI entry point in the header, separate from the floating action button used in Assembler
• AI provider selection was hardcoded in multiple places, making it difficult to switch between providers per build type

Notes

• The flyout body, keyboard shortcuts, and API health check are now shared via a useAskAiFlyout hook
• Codex forces AgentBuilder as the AI provider; Assembler continues to default to LlmGateway
• Console logger now prints exception details when available

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