#31 File icon for nadle config files

[nam-hle]

Summary

• Add NadleIconProvider that shows the nadle icon on all nadle.config.* files
• Register <iconProvider> extension point in plugin.xml

Nadle icon now appears in the project tree, editor tabs, Recent Files, and Search Everywhere.

Closes #31

Test plan

• Open a project containing nadle.config.ts / .js / .mjs / .cjs / .mts / .cts
• Verify nadle icon appears in project tree
• Verify nadle icon appears in editor tabs
• Verify nadle icon appears in Recent Files and Search Everywhere
• Verify non-nadle files are unaffected

🤖 Generated with Claude Code

[github-actions]

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It seems all right 👌

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