File-to-DB graph import results in loss of embedded asset alt text

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### Search first

- [x] I searched and no similar issues were found

### What Happened?

I migrated from OG to DB only to find all my embedded asset alt texts had not survived the migration

### Reproduce the Bug

1. In Logseq OG 1.0.0
1. Add new graph "Temp"
2. Create new page "This Is the Page Name"
3. Add file "this-is-the-file-name.pdf" to page
4. Edit alt text (see screenshot)
1. From "this-is-the-file-name.pdf"
2. To "This is the alt text"
2. In Logseq 2.0.1
1. "Import existing notes" → "File to DB graph"
2. Select Temp graph from step 1.1
3. Select "Submit" to import
4. Navigate to page This Is the Page Name

### Expected Behavior

On the page imported from OG to DB, the alt text is completely gone (see screenshot), replaced by the asset name.
When importing, could the asset name be set to the alt text instead of the file name?
I don't want to lose the alt next on all my assets when migrating to Logseq DB

### Screenshots

## In Logseq OG

## In Logseq DB

### Files

_No response_

### Browser, Desktop or Mobile Platform Information

OS: Kubuntu 26.04
Source: Desktop Logseq OG 1.0.0 (revision 680b371)
Destination: Desktop Logseq 2.0.1 (revision b09316a)

### Additional Context

Installed plugins:

- Bullet Threading
- Journals calendar

Result is the same with these plugins disabled

Dev tools console has no errors

### 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 described OG 1.0.0 to DB 2.0.1 migration through “Import existing notes” → “File to DB graph,” using an embedded asset with edited alt text. Trace that import flow to find where the asset name replaces the alt text; done means the imported page preserves the original alt text instead of the file name.

Written by the indexing model from the issue text.