feat: complete Rust-to-Go rewrite with Bubbletea v2
Rewrites oxker from Rust/ratatui to Go/Bubbletea, migrated to the Bubbletea v2 API (charm.land/bubbletea/v2). Removes all original Rust source files and legacy Go modules (internal/ui, internal/input, bubbles). Key changes: - View() returns tea.View with declarative AltScreen and MouseMode - KeyMsg → KeyPressMsg, MouseMsg → MouseClickMsg/WheelMsg/MotionMsg/ReleaseMsg - execWriteKey rewritten for v2 key fields (Code/Mod/Text) - Mouse toggle via View field instead of imperative commands - Filter/search text input uses msg.Text for v2 space key compat Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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