fix(tabs): correctly display oil.nvim buffers in tabline

[tea06194]

Fixes #1267

oil.nvim uses oil:// URIs as buffer names. fnamemodify() does not handle URI
schemes correctly and returns an empty string, causing tabs to show [No Name].

This patch detects oil buffers explicitly and strips the oil:// prefix before
formatting the path, keeping existing tabline behavior intact.

[abeaufays]

Hello ! I believe you have missed the oil extension?
See https://github.com/nvim-lualine/lualine.nvim/blob/master/lua/lualine/extensions/oil.lua
You can use it like this:

    {
        'nvim-lualine/lualine.nvim',
        dependencies = { 'nvim-tree/nvim-web-devicons' },
        config = function()
            require('lualine').setup {
                extensions = { 'oil' },
            }
        end,
    },

[abeaufays]

In case you were not satisfied with the oil extension, I made a PR about it too: #1488

[tea06194]

@abeaufays

Hello ! I believe you have missed the oil extension? See https://github.com/nvim-lualine/lualine.nvim/blob/master/lua/lualine/extensions/oil.lua You can use it like this:

    {
        'nvim-lualine/lualine.nvim',
        dependencies = { 'nvim-tree/nvim-web-devicons' },
        config = function()
            require('lualine').setup {
                extensions = { 'oil' },
            }
        end,
    },

Thanks for the suggestion!

This change simply extends the existing special-case handling in
Tab:label() (fugitive/help/terminal) to cover oil buffers, which expose
URI-based buffer names that fnamemodify() cannot handle directly.
This logic is part of the tabline tabs component and does not overlap with
statusline extensions.