feat: support snacks picker highlights

[techwizrd]

Summary

• Add Dracula highlight links for folke/snacks.nvim picker UI groups.
• Improve picker row selection, match text, file/path labels, and git status colors.
• Keep the integration consistent by linking to existing Dracula highlight groups.

Verification

• Loaded the colorscheme successfully in Neovim:

nvim --headless -u NONE +'set rtp^=.' +'set termguicolors' +'colorscheme dracula' +'quit'

• Verified Snacks picker highlight links with a reproducible local config using folke/snacks.nvim and nvim-mini/mini.icons:

SnacksPickerListCursorLine -> DraculaSelection
SnacksPickerMatch -> DraculaCyan
SnacksPickerSelected -> DraculaPink
SnacksPickerFile -> DraculaFg
SnacksPickerDirectory -> Directory
SnacksPickerGitStatusModified -> DiagnosticWarn

• Manually inspected the picker UI with icons enabled.

[benknoble]

I don't have any objections to this implementation, though I may tweak the commit message when merging.

I don't use the relevant plugins, though, so feedback from @figmads is very welcome.

I wonder if the lua/ and doc/ that are made subtle in the screenshot are too low-contrast (esp. when the highlighting from the current selection is overlaid)? Idk.

[techwizrd]

I can bump up the contrast and amend the commit message. It is a little terse. Do you have suggestions on which colors might be a little better fit?

[benknoble]

I can bump up the contrast and amend the commit message. It is a little terse.

Looking back, I'm not sure what I meant about the commit. A few thoughts

• any thing "non-standard" worth calling out ?
• I prefer imperative Close <link> with a full URL.

Do you have suggestions on which colors might be a little better fit?

Honestly no. It may not be an issue. 🤷

Thanks!