[Bug 2148223] [NEW] helpviewer: improve viewer detection and robustness

[Arnab Patra]

Public bug reported:

The current helpviewer.py uses hardcoded paths (/usr/bin/yelp) and lacks
robust validation and logging.

This patch improves:

- Use shutil.which() instead of hardcoded paths
- Add support for khelpcenter (KDE help viewer)
- Validate documentation topic input
- Improve privilege handling when running under sudo
- Add logging for better diagnostics

No behavior changes intended.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "helpviewer.patch"
   https://bugs.launchpad.net/bugs/2148223/+attachment/5960933/+files/helpviewer.patch

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https://bugs.launchpad.net/bugs/2148223

Title:
  helpviewer: improve viewer detection and robustness

Status in update-manager package in Ubuntu:
  New

Bug description:
  The current helpviewer.py uses hardcoded paths (/usr/bin/yelp) and lacks
  robust validation and logging.

  This patch improves:

  - Use shutil.which() instead of hardcoded paths
  - Add support for khelpcenter (KDE help viewer)
  - Validate documentation topic input
  - Improve privilege handling when running under sudo
  - Add logging for better diagnostics

  No behavior changes intended.

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