[I] [Bug] CSV export only includes the current preview page instead of all filtered data [tsfile-viewer]

["moneymouse (via GitHub)" <gi...@apache.org>]

moneymouse opened a new issue, #45:
URL: https://github.com/apache/tsfile-viewer/issues/45

   ### Description
   
   CSV export in Data Preview only exports the currently loaded page.
   However, the Chinese user guide states that exports include all data
   matching the current filters, rather than only the current page.
   
   ### Steps to reproduce
   
   1. Open a tree-model TsFile containing more matching records than one page.
   2. Select a device and apply the filters.
   3. Click "Export CSV".
   4. Navigate to another page and export again.
   
   ### Actual behavior
   
   Each export contains only the records displayed on the current page.
   Changing the preview page changes the exported subset.
   
   ### Expected behavior
   
   Export all records matching the applied filters within the current TsFile,
   independently of the preview page and page size.
   
   ### Code reference
   
   In frontend/src/views/tsfile/data-preview/index.vue, exportCSV()
   serializes dataRows, which contains only the paginated preview response.
   exportJSON() uses the same data source and appears to have the same limitation.
   
   Affected source: main at commit
   73cca1f65980efe803559a429e50b4ff29c774f6.


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