Add git status symbols with gitsigns.nvim

[Copilot]

Adds visual git change indicators in the sign column using gitsigns.nvim.

Changes

• Visual indicators: Added symbols for tracked changes (┃ add/modify, _ delete, ‾ topdelete, ~ changedelete, ┆ untracked)
• Navigation: ]c/[c for next/previous hunk
• Hunk operations: <leader>h{s,r,p,b} for stage/reset/preview/blame, <leader>hS/hR for buffer-level ops
• Diff & blame: <leader>hd/hD/tb/td for diff views and inline blame toggle
• Text object: ih selects git hunks in visual/operator mode
• Performance: Lazy loading on buffer events, 100ms debounce, 40k line limit

Jujutsu VCS Note

gitsigns.nvim is git-only. For jujutsu support, experimental alternatives exist:

• jj-sign.nvim - Direct port to jj
• panda.nvim - Real-time VCS feedback for jj

Both are early-stage; consider switching when mature.

-- Example configuration
signs = {
  add          = { text = "┃" },
  change       = { text = "┃" },
  delete       = { text = "_" },
  untracked    = { text = "┆" },
}

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