fix(import): support multi-file markdown drops

[ThisIs-Developer]

Summary

Fixes multi-file local Markdown imports so drag-and-drop processes every supported dropped file instead of only files[0].

What changed

• Added a shared Markdown file filter and multi-file import helper.
• Made importMarkdownFile promise-based so dropped files are opened sequentially in the browser-provided order.
• Reused the same multi-file path for the file picker and enabled multiple on the hidden file input.
• Updated root web assets and the desktop resource copies with matching drop/import UI text.

Root cause

The drop handler read only the first item from DataTransfer.files, so any additional valid Markdown files in the same drop were ignored. Reading files asynchronously without coordination could also risk tab ordering, so the new helper awaits each import in order.

Validation

• node --check script.js
• node --check desktop-app/resources/js/script.js
• Node harness around the actual import helper block for both scripts, verifying a mixed drop imports three Markdown files in order: 01-first, 02-second, 03-third.
• Loaded the local app at http://127.0.0.1:4173/index.html and confirmed the file input has multiple enabled.
• git diff --check (clean; Git reported only existing Windows line-ending conversion warnings).

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Project	Deployment	Actions	Updated (UTC)
markdown-viwer	Ready	Preview, Comment	Jul 6, 2026 1:39pm

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