tmux: clipboard integration

- copy-mode-vi: map  to copy-pipe-and-cancel -> ~/.config/tmux/scripts/copy_to_clipboard.sh
- add C-S-v and M-V to paste from system clipboard (works over SSH)
- add scripts: paste_from_clipboard.sh, copy_to_clipboard.sh

Only staged clipboard-related changes; other edits remain unstaged.

tmux/scripts/copy_to_clipboard.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+content=$(cat | tr -d '\r')
+# Update tmux buffer and system clipboard (uses tmux set-clipboard setting)
+tmux set-buffer -w -- "$content"
+
+# Best-effort: also call platform clip utilities when available
+if command -v pbcopy >/dev/null 2>&1; then
+  printf '%s' "$content" | pbcopy || true
+elif command -v wl-copy >/dev/null 2>&1; then
+  printf '%s' "$content" | wl-copy --type text || wl-copy || true
+elif command -v xclip >/dev/null 2>&1; then
+  printf '%s' "$content" | xclip -selection clipboard || true
+elif command -v xsel >/dev/null 2>&1; then
+  printf '%s' "$content" | xsel --clipboard --input || true
+elif command -v powershell.exe >/dev/null 2>&1; then
+  powershell.exe -NoProfile -Command Set-Clipboard -Value @"
+${content}
+"@ || true
+fi
+

tmux/scripts/paste_from_clipboard.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+read_clipboard() {
+  if command -v pbpaste >/dev/null 2>&1; then
+    pbpaste
+    return 0
+  fi
+  if command -v wl-paste >/dev/null 2>&1; then
+    wl-paste --no-newline 2>/dev/null || wl-paste
+    return 0
+  fi
+  if command -v xclip >/dev/null 2>&1; then
+    xclip -selection clipboard -o 2>/dev/null || true
+    return 0
+  fi
+  if command -v xsel >/dev/null 2>&1; then
+    xsel -o --clipboard 2>/dev/null || true
+    return 0
+  fi
+  if command -v powershell.exe >/dev/null 2>&1; then
+    powershell.exe -NoProfile -Command Get-Clipboard 2>/dev/null || true
+    return 0
+  fi
+  return 1
+}
+
+content=$(read_clipboard || true)
+if [[ -z "${content:-}" ]]; then
+  exit 0
+fi
+
+# normalize CRLF -> LF
+content=$(printf '%s' "$content" | tr -d '\r')
+
+tmux set-buffer -- "$content"
+tmux paste-buffer -p -d
+