move fetch logic and use from solid-logic

[SharonStrats]

No description provided.

[Copilot]

Pull request overview

This PR refactors source-pane resource fetching by removing the local resourceLoader utilities and switching the UI components to call the solid-logic singleton for content/metadata retrieval.

Changes:

• Removed src/resourceLoader.ts and updated components to use solidLogicSingleton.resource.* for fetching content and resource metadata.
• Updated SourceProvider and SourceEditorCard to adapt to the new metadata shape/flow.
• Removed test/helpers.test.js which previously validated response-header metadata extraction and fetch+metadata behavior.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
test/helpers.test.js	Removes unit tests that covered metadata extraction and fetch+metadata behavior.
src/resourceLoader.ts	Removes the in-repo fetch/metadata helper functions in favor of solid-logic.
src/components/source-provider/SourceProvider.ts	Switches initial content+metadata loading to solidLogicSingleton.resource.fetchContentAndMetadata.
src/components/source-editor-card/SourceEditorCard.ts	Switches post-save metadata refresh to solidLogicSingleton.resource.fetchResourceMetadata.

Suppressed comments (1)

src/components/source-editor-card/SourceEditorCard.ts:202

• The nested try/catch around metadata refresh only rethrows the error and doesn’t add any handling; the outer try/catch already handles failures. Removing the inner block reduces indentation and makes the control flow clearer.

      try {
        const metadata = await solidLogicSingleton.resource.fetchResourceMetadata(saveSubject as any)
          sourceContext.updateMetadata({
            contentType: metadata.contentType,
            eTag: metadata.eTag
          })
        this._resetEditorState()
      } catch (err) {
        throw err
      }

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