feat(init): migrate snacks dashboard to mini.starter

[rstacruz]

Summary

• Replace the snacks dashboard setup with mini.starter
• Keep the startup config aligned with the new dashboard flow

Notes

• Single-file change in init.lua

[Copilot]

Pull request overview

Migrates the Neovim startup dashboard flow from snacks.nvim’s dashboard to mini.starter, while keeping the existing “no-args startup” behavior and retaining Snacks for pickers/other utilities.

Changes:

• Added mini.starter configuration (recent files + custom “Actions” section) and buffer-local starter keymaps on MiniStarterOpened.
• Removed the snacks.dashboard configuration and replaced “open dashboard” flows with mini.starter opening logic.
• Reused a new get_cwd_name() helper for both starter header and tabline cwd display.

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