feat: Highlight and prioritize code definitions in grep results

[yashksaini-coder]

Fixes:- #297

This PR adds definition detection to the grep engine.

• Prioritization: Definitions are now stably sorted to the top of the results.
• Visuals: Added a [def] indicator highlighted with combo_header to make symbols pop.
• Config: New classify_definitions toggle added to grep settings (default false).

Kept it focused on definitions only for now to avoid messing with the UI for context lines.

@dmtrKovalenko

[dmtrKovalenko]

Thank you for the contribution but I think we can make it even better

[yashksaini-coder]

@dmtrKovalenko can we run the CI/CD checks. I've updated the branch to latest commit

[dmtrKovalenko]

Thank you. If you don’t mind I’ll push to your PR with some changes I’d like to tune how this feature feels

[yashksaini-coder]

Thank you. If you don’t mind I’ll push to your PR with some changes I’d like to tune how this feature feels

Sure why not works for me @dmtrKovalenko Would like to see your approach as well for improving the highlighting in grep

[yashksaini-coder]

Hi @dmtrKovalenko follownig up on my PR, have you made any changes ? also I see some skipped workflows are they manual based for maintainers or reviewers

[Copilot]

Pull request overview

This PR exposes the core grep engine’s definition-classification signal to Neovim and uses it to visually mark definition matches and optionally prioritize them in results, controlled via a new grep.classify_definitions config toggle.

Changes:

• Added grep.classify_definitions (default false) and threaded it through the Lua → Rust FFI → core grep options.
• Exposed is_definition on each grep match item to Lua and rendered a [def] indicator in the grep UI.
• When enabled, core grep post-processes results to prioritize definition matches.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
lua/fff/grep/init.lua	Passes classify_definitions through to the Rust live_grep FFI call.
lua/fff/grep/grep_renderer.lua	Adds virtual-text [def] marker for definition matches.
lua/fff/conf.lua	Adds grep.classify_definitions to config typing + defaults.
crates/fff-nvim/src/lua_types.rs	Includes is_definition in Lua grep match items.
crates/fff-nvim/src/lib.rs	Adds classify_definitions as a new optional live_grep parameter and forwards into GrepSearchOptions.
crates/fff-core/src/grep.rs	Sorts matches to prioritize definitions when classification is enabled.

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[yashksaini-coder]

@dmtrKovalenko I have addressed the concerns and issues raised by copilot review, looking forward to your review and feedback, Thanks

[dmtrKovalenko]

I am sorry brother, I have been working on some additional changes because I really want this feature to shine and jumped away to the random markerting PRs

i will revisit, push some changes and merge this PR in a few days