[idea] Show git diff hunk stats in statusline via gitsigns_status_dict

[stanfish06]

What

Add +N ~N -N hunk counts to the statusline's git section, sourced from vim.b.gitsigns_status_dict — the same buffer-local variable that already powers the branch name display.

Where

lua/config/statusline.lua:27-33 — the current_git_branch() function.

Why it matters

The statusline already reads vim.b.gitsigns_head for the branch name. gitsigns also populates vim.b.gitsigns_status_dict with { added = N, changed = N, removed = N } for free — no extra API calls. Adding the counts gives a quick at-a-glance diff summary without opening fugitive or running :Gstatus.

This is especially useful during the iterative edit-format-commit cycle across the six active LSP languages (Lua, Python, TypeScript, Rust, Go, Swift), where knowing "I have 5 additions and 2 changes in this buffer" is a constant need.

Sketch

local function current_git_branch()
    local ok, gs = pcall(require, "gitsigns")
    if not ok then return "" end
    local branch = vim.b.gitsigns_head
    if not branch or branch == "" then return "" end

    local stats = vim.b.gitsigns_status_dict
    local diff = ""
    if stats then
        local added   = stats.added   or 0
        local changed = stats.changed or 0
        local removed = stats.removed or 0
        if added > 0 or changed > 0 or removed > 0 then
            diff = string.format(" +%d ~%d -%d", added, changed, removed)
        end
    end

    return " %#Git#  " .. branch .. diff .. " " .. "%*"
end

The diff string is omitted when all counts are zero (clean buffer), keeping the statusline tidy for unmodified files.

Notes

• Requires gitsigns to be set up (see issue [idea] configure gitsigns.nvim keymaps for hunk staging and blame #14). Once that's done, vim.b.gitsigns_status_dict is populated automatically.
• Colors can be split per-segment (green +, yellow ~, red -) using additional highlight groups if desired, but a single %#Git# block is the simplest starting point.

[stanfish06]

Duplicate of #278 (same idea: gitsigns diff stats in the statusline via vim.b.gitsigns_status_dict). See #278 for tracking; #170 closed as a duplicate too.

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