Replace dolphin with open for cross-platform compatibility

[Copilot]

Replace KDE-specific dolphin command with open for opening files in the system file manager.

Changes

• Updated lua/keymaps/normal-keymaps.lua keymap <C-e>:
  • !dolphin → !open (both invocations)
  • Removed --select flag (not needed with open)
  • Updated description to remove OS-specific reference

# Before
vim.cmd("!dolphin --select" .. " " .. path)

# After  
vim.cmd("!open " .. path)

The open command works natively on macOS and is more easily aliased/adapted on Linux systems than the KDE-specific dolphin.

Original prompt

replace dolphin" .. with open" ..

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