Markdown mirror exports single-value properties with "Multiple values" disabled as list syntax (multi-value)

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What Happened?

In the Markdown mirror, a text property that has "Multiple values" disabled is incorrectly exported using multi-value list syntax instead of a single-value property line.

For example, instead of:
myprop:: some value

It exports as:

myprop::
  - some value

Reproduce the Bug

1. Create a text property on a node and ensure "Multiple values" is disabled for it.
2. Assign a single text value to this property (e.g., myprop:: some value).
3. Check the Markdown mirror view or exported Markdown file for that node.

Observed: The property is rendered as a multi-value list:

myprop::
  - some value

Expected Behavior

Properties with "Multiple values" disabled should be exported in the Markdown mirror as a standard single-value property line (e.g., myprop:: some value), not as a bulleted list.

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Files

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Browser, Desktop or Mobile Platform Information

• Platform: Linux Desktop
• Version: 2.0.1-alpha+nightly.20260917 (DB beta)

Additional Context

Affects the database-to-Markdown synchronization / mirror representation for properties.

Are you willing to submit a PR? If you know how to fix the bug.

• I'm willing to submit a PR (Thank you!)

Start by reproducing the issue with a text property whose "Multiple values" setting is disabled, then inspect the Markdown mirror export path for property rendering. Compare the output with the expected single-value line myprop:: some value; done means single-value properties no longer use bulleted-list syntax while multi-value properties remain unaffected.