v0.63.0

_Release highlights: https://junegunn.github.io/fzf/releases/0.63.0/_

![image](https://github.com/user-attachments/assets/9f2e252b-75f5-4b42-a2d1-ccdb2394bc90)

- Added footer. The default border style for footer is `line`, which draws a single separator line.
  ```sh
  fzf --reverse --footer "fzf: friend zone forever"
  ```
  - Options
      - `--footer[=STRING]`
      - `--footer-border[=STYLE]`
      - `--footer-label=LABEL`
      - `--footer-label-pos=COL[:bottom]`
  - Colors
      - `footer`
      - `footer-bg`
      - `footer-border`
      - `footer-label`
  - Actions
      - `change-footer`
      - `transform-footer`
      - `bg-transform-footer`
      - `change-footer-label`
      - `transform-footer-label`
      - `bg-transform-footer-label`
- `line` border style is now allowed for all types of border except for `--list-border`.
  ```sh
  fzf --height 50% --style full:line --preview 'cat {}' \
      --bind 'focus:bg-transform-header(file {})+bg-transform-footer(wc {})'
  ```
- Added `{*}` placeholder flag that evaluates to all matched items.
  ```bash
  seq 10000 | fzf --preview "awk '{sum += \$1} END {print sum}' {*f}"
  ```
  - Use this with caution, as it can make fzf sluggish for large lists.
- Added asynchronous transform actions with `bg-` prefix that run asynchronously in the background, along with `bg-cancel` action to cancel currently running `bg-transform` actions.
  ```sh
  # Implement popup that disappears after 1 second
  #   * Use footer as the popup
  #   * Use `bell` to ring the terminal bell
  #   * Use `bg-transform-footer` to clear the footer after 1 second
  #   * Use `bg-cancel` to cancel currently running background transform actions
  fzf --multi --list-border \
      --bind 'enter:execute-silent(echo -n {+} | pbcopy)+bell' \
      --bind 'enter:+transform-footer(echo Copied {} to clipboard)' \
      --bind 'enter:+bg-cancel+bg-transform-footer(sleep 1)'

  # It's okay for the commands to take a little while because they run in the background
  GETTER='curl -s http://metaphorpsum.com/sentences/1'
  fzf --style full --border --preview : \
      --bind "focus:bg-transform-header:$GETTER" \
      --bind "focus:+bg-transform-footer:$GETTER" \
      --bind "focus:+bg-transform-border-label:$GETTER" \
      --bind "focus:+bg-transform-preview-label:$GETTER" \
      --bind "focus:+bg-transform-input-label:$GETTER" \
      --bind "focus:+bg-transform-list-label:$GETTER" \
      --bind "focus:+bg-transform-header-label:$GETTER" \
      --bind "focus:+bg-transform-footer-label:$GETTER" \
      --bind "focus:+bg-transform-ghost:$GETTER" \
      --bind "focus:+bg-transform-prompt:$GETTER"
  ```
- Added support for full-line background color in the list section
  ```sh
  for i in $(seq 16 255); do
    echo -e "\x1b[48;5;${i}m\x1b[0Khello"
  done | fzf --ansi
  ```
- SSH completion enhancements by @akinomyoga
- Bug fixes and improvements