The --accept-nth option was not being respected when using --filter mode.
This caused fzf to output entire lines instead of only the specified fields.

Added buildItemTransformer() helper function to consistently apply field
transformations across filter mode (both streaming and non-streaming) and
select1/exit0 modes.

Fixes junegunn#4615

This MR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [junegunn/fzf](https://github.com/junegunn/fzf) | minor | `v0.67.0` → `v0.68.0` |

MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot).

**Proposed changes to behavior should be submitted there as MRs.**

---

### Release Notes

<details>
<summary>junegunn/fzf (junegunn/fzf)</summary>

### [`v0.68.0`](https://github.com/junegunn/fzf/releases/tag/v0.68.0): 0.68.0

[Compare Source](junegunn/fzf@v0.67.0...v0.68.0)

<https://github.com/user-attachments/assets/8d9e6e29-1bde-49d3-b580-c560da394a5d>

- Implemented word wrapping in the list section
  - Added `--wrap=word` (or `--wrap-word`) option and `toggle-wrap-word` action for word-level line wrapping in the list section
  - Changed default binding of `ctrl-/` and `alt-/` from `toggle-wrap` to `toggle-wrap-word`
  ```sh
  fzf --wrap=word
  ```
- Implemented word wrapping in the preview window
  - Added `wrap-word` flag for `--preview-window` to enable word-level wrapping
  - Added `toggle-preview-wrap-word` action
  ```sh
  fzf --preview 'bat --style=plain --color=always {}' \
      --preview-window wrap-word \
      --bind space:toggle-preview-wrap-word
  ```
- Added support for underline style variants in `--color`: `underline-double`, `underline-curly`, `underline-dotted`, `underline-dashed`
  ```sh
  fzf --color 'fg:underline-curly,current-fg:underline-dashed'
  ```
- Added support for underline styles (`4:N`) and underline colors (SGR 58/59)
  ```sh
  # In the list section
  printf '\e[4:3;58;2;255;0;0mRed curly underline\e[0m\n' | fzf --ansi

  # In the preview window
  fzf --preview "printf '\e[4:3;58;2;255;0;0mRed curly underline\e[0m\n'"
  ```
- Added `--preview-wrap-sign` to set a different wrap indicator for the preview window
- Added `alt-gutter` color option ([#&#8203;4602](junegunn/fzf#4602)) ([@&#8203;hedgieinsocks](https://github.com/hedgieinsocks))
- Added `$FZF_WRAP` environment variable to child processes (`char` or `word` when wrapping is enabled) ([#&#8203;4672](junegunn/fzf#4672)) ([@&#8203;bitraid](https://github.com/bitraid))
- fish: Improved command history (CTRL-R) ([#&#8203;4672](junegunn/fzf#4672)) ([@&#8203;bitraid](https://github.com/bitraid))
  - Enabled syntax highlighting in the list on fish 4.3.3+
  - Added syntax-highlighted preview window that auto-shows for long or multi-line commands
  - Added `ALT-ENTER` to reformat and insert selected commands
  - Improved handling of bulk deletion of selected history entries (`SHIFT-DELETE`)
- Added fish completion support ([#&#8203;4605](junegunn/fzf#4605)) ([@&#8203;lalvarezt](https://github.com/lalvarezt))
- zsh: Handle multi-line history selection ([#&#8203;4595](junegunn/fzf#4595)) ([@&#8203;LangLangBart](https://github.com/LangLangBart))
- Bug fixes
  - Fixed `_fzf_compgen_{path,dir}` to respect `FZF_COMPLETION_{PATH,DIR}_OPTS` ([#&#8203;4592](junegunn/fzf#4592)) ([@&#8203;shtse8](https://github.com/shtse8), [@&#8203;LangLangBart](https://github.com/LangLangBart))
  - Fixed `--preview-window follow` not working correctly with wrapping ([#&#8203;3243](junegunn/fzf#3243), [#&#8203;4258](junegunn/fzf#4258))
  - Fixed symlinks to directories being returned as files ([#&#8203;4676](junegunn/fzf#4676)) ([@&#8203;skk64](https://github.com/skk64))
  - Fixed SIGHUP signal handling ([#&#8203;4668](junegunn/fzf#4668)) ([@&#8203;LangLangBart](https://github.com/LangLangBart))
  - Fixed preview process not killed on exit ([#&#8203;4667](junegunn/fzf#4667))
  - Fixed coloring of items with zero-width characters ([#&#8203;4620](junegunn/fzf#4620))
  - Fixed `track-current` unset after a combined movement action ([#&#8203;4649](junegunn/fzf#4649))
  - Fixed `--accept-nth` being ignored in filter mode ([#&#8203;4636](junegunn/fzf#4636)) ([@&#8203;charemma](https://github.com/charemma))
  - Fixed display width calculation with `maxWidth` ([#&#8203;4596](junegunn/fzf#4596)) ([@&#8203;LangLangBart](https://github.com/LangLangBart))
  - Fixed clearing of the rest of the current line on start ([#&#8203;4652](junegunn/fzf#4652))
  - Fixed `x-api-key` header not required for GET requests ([#&#8203;4627](junegunn/fzf#4627))
  - Fixed key reading not cancelled when `execute` triggered via a server request ([#&#8203;4653](junegunn/fzf#4653))
  - Fixed rebind of readline command `redraw-current-line` ([#&#8203;4635](junegunn/fzf#4635)) ([@&#8203;jameslazo](https://github.com/jameslazo))
  - Fixed `fzf-tmux` `TERM` quoting and added `mktemp` usage ([#&#8203;4664](junegunn/fzf#4664)) ([@&#8203;Goofygiraffe06](https://github.com/Goofygiraffe06))
  - Do not allow very long queries in `FuzzyMatchV2` ([#&#8203;4608](junegunn/fzf#4608))

</details>

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