ENG-1748: Add shared template import panel for node types

[trangdoan982]

https://www.loom.com/share/6343ad0f31bf4e37a3cb62c1c53da546

Summary

• add a dedicated "Import template from groups" flow in Node Type settings with candidate fetching, selection, and one-click import into the local templates folder
• Template Import UI is a split-panel modal with template list metadata (name, optional author, source space, publish time) and live markdown preview
• prevent duplicate imports by naming imported templates as <template> (from <space>) and filtering already imported candidates from the panel

Test plan

• Open Obsidian settings > Node Types > edit a node type > Template dropdown > Import template from groups
• Confirm split layout: left candidate list + right markdown preview, with independent vertical scrolling
• Import a template and verify local template name format is <template> (from <space>).md
• Re-open import panel and verify the imported candidate no longer appears
• Click "Import & use" and verify the selected node type template field is updated to the imported file

Made with Cursor

[linear-code]

ENG-1748

[graphite-app]

PR size/scope check

This PR is over our review-size guideline.

• Recommended: ~200 lines changed
• Acceptable limit: up to 400 lines when well-scoped/self-contained
• Preferred file count: fewer than 5 files

Please split this into smaller PRs unless there is a clear reason the changes need to land together.

If keeping it as one PR, please add a brief justification covering:

• What single problem this PR solves
• Why the files/changes are coupled

[supabase]

This pull request has been ignored for the connected project zytfjzqyijgagqxrzbmz because there are no changes detected in packages/database/supabase directory. You can change this behaviour in Project Integrations Settings ↗︎.

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