Fixing #173, #186 - Data Source Selector and Standalone Maps

[TheWitness]

This fix does the following:

• Issue Data Source select queries slow or not working #173 - Improve the Data Source query performance
• Issue Graph popup missing from weathermap generated using HTMLOUTPUTFILE and IMAGEOUTPUTFILE #186 - Popups not working in standalone mode
• Minor - Reformatting stats log message

This change simplifies the logic in weathermap.js to be less convoluted and encodes the data-hover string to reduce issues related to displaying embedded html inside of an html attribute.

[Copilot]

Pull request overview

This PR addresses two reported weathermap plugin issues by optimizing editor autocomplete queries (Data Source selector) and making standalone-generated HTML maps include the necessary JS/CSS for hover popups, plus a small stats log message tweak.

Changes:

• Optimize graph/data source autocomplete SQL in lib/editor.inc.php to reduce joins and broaden search matching.
• Make standalone HTML exports self-contained enough to support hover popups by adding required assets and encoding hover payloads safely.
• Adjust poller logging/HTML output handling and update the changelog.

Reviewed changes

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

Show a summary per file

File	Description
lib/poller-common.php	Improves HTML output writability checks, generates standalone HTML output, and tweaks log message text.
lib/editor.inc.php	Refactors graph/data source selector queries for performance and search behavior.
lib/WeatherMap.class.php	Base64-encodes hover payloads and adds standalone HTML wrapper/assets via MakeHTML(..., $standalone=true).
lib/HTML_ImageMap.class.php	Indentation-only changes to generated <area> HTML.
js/weathermap.js	Decodes base64 hover payloads and adjusts tooltip behavior/DOM handling.
CHANGELOG.md	Notes fixes for issues #173 and #186.

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