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>

internal/utils/table.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"strings"
+
+	"github.com/olekukonko/tablewriter"
+)
+
+func FormatTable(data [][]string) string {
+	var sb strings.Builder
+	table := tablewriter.NewWriter(&sb)
+	table.SetHeader([]string{})
+	table.SetBorder(false)
+	table.SetColMinWidth(0, 10)
+	table.SetColMinWidth(1, 20)
+	table.SetColMinWidth(2, 25)
+	table.SetColMinWidth(3, 15)
+	table.SetColMinWidth(4, 20)
+
+	for _, row := range data {
+		table.Append(row)
+	}
+
+	table.Render()
+	return sb.String()
+}