Normalize /statusline & /title items

[canvrno-oai]

This change aligns the /statusline and /title UIs around the same normalized item model so both surfaces use consistent ids, labels, and preview semantics. It keeps the shared preview work from #18435 , tightens the remaining mismatches by standardizing item naming, expands title/status item coverage where appropriate, and makes /title preview use the same title-specific formatting path as the real rendered terminal title.

• Normalizes persisted item ids and keeps legacy aliases for compatibility
• Aligns status-line and terminal-title items with the shared preview model
• Routes terminal-title preview through title-specific formatting and truncation
• Updates the affected status/title setup snapshots

Added to /statusline:

• status
• task-progress

Normalized in /statusline:

• model-name -> model
• project-root -> project-name

Added to /title:

• current-dir
• context-remaining
• context-used
• five-hour-limit
• weekly-limit
• codex-version
• used-tokens
• total-input-tokens
• total-output-tokens
• session-id
• fast-mode
• model-with-reasoning

Normalized in /title:

• project -> project-name
• thread -> thread-title
• model-name -> model

[canvrno-oai]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

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[etraut-openai]

Overall, looks good.

My one concern is about the "status" item; I think the name is too general. Perhaps use "run-state" or "activity-state" or "work-state" or "execution-state" instead.

I built locally and manually tested. Worked great!