FIX: image aspect ratio rendering and edits

[merefield]

• ensures markdown image thumbnail has consistent aspect ratio
• ensures edits do not change aspect ratio
• however, edits can specify an aspect ratio as optional

[Copilot]

Pull request overview

Updates the chatbot “paint” and “paint_edit” image workflows so generated/edited image markdown preserves the actual image aspect ratio (and allows an optional aspect ratio override for edits), aligning rendering behavior with the underlying upload dimensions.

Changes:

• Render image markdown using upload width/height (with a size fallback) instead of a fixed 690x460.
• Preserve original aspect ratio for edits by default, with optional aspect_ratio override support.
• Add/extend specs covering markdown parsing, aspect ratio detection, and markdown rendering.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
spec/lib/message_reply_creator_spec.rb	Adds coverage to ensure uploads are found from markdown with arbitrary dimensions.
spec/lib/functions/paint_function_spec.rb	Updates/extends specs for class helpers and markdown rendering using upload dimensions.
spec/lib/functions/paint_edit_function_spec.rb	Adds coverage for aspect ratio override vs. “keep original” behavior.
plugin.rb	Bumps plugin version to 1.7.1.
lib/discourse_chatbot/message/message_reply_creator.rb	Generalizes markdown parsing to match any WxH dimensions and simplifies upload lookup iteration.
lib/discourse_chatbot/functions/paint_function.rb	Centralizes aspect ratio + markdown helpers; renders markdown using upload dimensions.
lib/discourse_chatbot/functions/paint_edit_function.rb	Adds aspect_ratio parameter and resolves edit size based on original upload unless overridden.
config/locales/server.en.yml	Adds locale string for the new aspect_ratio override parameter on paint_edit.

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