feat(fzf): add fzf-lua integration for buffer and file selection

[xeon826]

File picker using fzf-lua to select git files or open buffers to add to the prompt. Use it like so:

		vim.keymap.set("t", "<C-f>", function()
			require("opencode").fzf.select_files()
		end, opts)
		vim.keymap.set("t", "<C-b>", function()
			require("opencode").fzf.select_buffers()
		end, opts)

[NickvanDyke]

Neat, thank you! I have thought about something like this.

I think it'd be more powerful and reusable the way sidekick.nvim does it. Is that possible in fzf-lua? That could get us started on supporting other pickers too. 🙂

[xeon826]

I created another branch using my fork that more resembles the functionality you're referring to but it seems opencode is lacking an endpoint for submitting file paths so I created an issue and rough draft branch of opencode for adding that.

[NickvanDyke]

I think that missing feature is fine for now - it's an optimization, not a requirement. And is consistent with other filepath references anyway.