feature: Add Via Style as a form option

[TheWitness]

This commit adds a new form element to control the Via Style of a Graph.

Closes #219

[Copilot]

Pull request overview

This PR adds a new “Via Style” control to the Weathermap editor’s Link Properties form, wiring it through the editor save action and into the link’s JS representation so the UI can round-trip the setting.

Changes:

• Add a Via Style <select> (curved/angled) to the link properties dialog in the editor UI.
• Persist the submitted viastyle value when saving link properties and expose it in the link asJS() payload.
• Update gettext template (cacti.pot) and add a helper script to rebuild/merge gettext files.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
weathermap-cacti-plugin-editor.php	Adds the Via Style form control and adjusts some link/node editor UI strings/indentation.
lib/editor.actions.php	Saves viastyle from the editor form into the link object.
lib/WeatherMapLink.class.php	Exposes viastyle in the link’s JS representation for the editor to consume.
js/editor.js	Populates the Via Style <select> when priming the link form.
locales/po/cacti.pot	Updates the POT with new/changed UI strings (including Via Style strings).
locales/build_gettext.sh	Adds a script for rebuilding/merging gettext catalogs and compiling .mo files.
CHANGELOG.md	Adds an entry referencing feature #219 for the Via Style UI addition.

Comments suppressed due to low confidence (1)

weathermap-cacti-plugin-editor.php:577

• The <select id='link_template'> element isn’t closed with a </select> before the cell ends. This is invalid HTML and may cause the Link Properties dialog to render inconsistently across browsers; add the missing closing tag after the PHP block.

										print '<option ' . (get_request_var('node_template') == $gt['id'] ? 'selected' : '');
										print ' value="' . $gt['id'] . '">' . html_escape($gt['name']) . '</option>';
									}
									?>
							</td>