feat: Sync complete config - Fish, Ghostty, Neovim Scratch

- Add missing Fish configs (direnv, ssh function)
- Add Tokyo Night theme for Ghostty
- Complete Neovim scratch config sync
- Rewrite install.sh for new structure
- Add comprehensive README.md

.config/nvim/lua/plugins/harpoon.lua

@@ -0,0 +1,31 @@
+-- ============================================================================
+-- Harpoon - Schneller File Wechsel
+-- ============================================================================
+
+return {
+  {
+    'ThePrimeagen/harpoon',
+    branch = 'harpoon2',
+    dependencies = { 'nvim-lua/plenary.nvim' },
+    config = function()
+      local harpoon = require('harpoon')
+      
+      -- REQUIRED: Setup
+      harpoon:setup()
+
+      -- Basic Keymaps
+      vim.keymap.set('n', '<leader>a', function() harpoon:list():add() end, { desc = 'Harpoon: Add file' })
+      vim.keymap.set('n', '<leader>h', function() harpoon.ui:toggle_quick_menu(harpoon:list()) end, { desc = 'Harpoon: Menu' })
+
+      -- Quick file navigation (1-4)
+      vim.keymap.set('n', '<C-j>', function() harpoon:list():select(1) end, { desc = 'Harpoon: File 1' })
+      vim.keymap.set('n', '<C-k>', function() harpoon:list():select(2) end, { desc = 'Harpoon: File 2' })
+      vim.keymap.set('n', '<C-l>', function() harpoon:list():select(3) end, { desc = 'Harpoon: File 3' })
+      vim.keymap.set('n', '<C-;>', function() harpoon:list():select(4) end, { desc = 'Harpoon: File 4' })
+
+      -- Toggle previous & next buffers stored within Harpoon list
+      vim.keymap.set('n', '<C-S-P>', function() harpoon:list():prev() end, { desc = 'Harpoon: Previous' })
+      vim.keymap.set('n', '<C-S-N>', function() harpoon:list():next() end, { desc = 'Harpoon: Next' })
+    end,
+  },
+}