fix: use compact rename popup for folders

[zhuamini-alt]

Background

Fixes #1148.

Current folder rename uses a full modal with a title + explicit update button. The issue asks for a compact popup-style experience (same pattern as doc rename), and saving via Enter or blur/click-away instead of a visible save button.

What changed

• Updated openRenameFolderForm in useCloudResourceModals.tsx to align with doc rename UX:
  • removed explicit submit button for folder rename popup
  • added onBlur persistence so clicking away saves changes
  • changed modal options to compact popup style:
    • showCloseIcon: false
    • width: 'small'

Why this approach

• Reuses the existing EmojiInputForm behavior already used by doc rename.
• Keeps update payload shape unchanged (workspaceId, parentFolderId, folderName, emoji).
• Minimizes scope/risk by changing only folder rename modal config + save trigger behavior.

Test evidence

• Static check run locally:
  • npx eslint src/cloud/lib/hooks/useCloudResourceModals.tsx

Edge cases considered

• Emoji can be unset on blur/submit (emoji normalized to null when non-string).
• Parent folder and workspace references are preserved in both submit and blur flows.
• Enter-to-save still works via form submit pathway; click-away save now works via onBlur.

Risk

• Low/medium: onBlur may trigger an update even if value is unchanged (same as existing doc-rename pattern). This is acceptable and consistent with current UX conventions in this codebase.

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