Add Option to Override Existing Subscription When Importing OPML Files

[EmilyYoung71415]

Clear and concise description of the problem

Due to the habit of regularly maintaining and slimming down subscription sources, which involves making significant changes to the subscription sources and organizational structure, However batch changing subscription sources in Follow has not been implemented yet. （Hope to have this：https://github.com/RSSNext/Follow/issues/782 ）

Suggested solution

I am now considering the fastest implementation plan(as a replacement for the Organize Feed subscriptions in bulk function）is for users to edit the OPML file themselves and then import it to overwrite the existing one.

workflow is like: 1.export OPML 2.edit it locally 3.import OPML and allow to override the subscription sources currently 4.get the new

So, the problem now is import OPML is merge mode and does not support overwriting.

Alternative

Trying alternative solutions: I have also tried batch selection.（https://github.com/RSSNext/Follow/pull/1062 ），However, drag-and-drop batch selection was not successful, and I also tried shift+right-click but was unable to achieve batch selection.

Additional context

No response

Validations

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[linear[bot]]

FOL-1666 Add Option to Override Existing Subscription When Importing OPML Files

[DIYgod]

It doesn't sound like a regular operation, we will create a management panel as an alternative, please refer to #782.