ALT-11032

[Tsyklop]

ALT-11032: Suggest sharing achievement on Hyperskill project completion

Summary

Adds a "share your achievement" flow that congratulates the user when they complete a Hyperskill project and offers to post about it on X or LinkedIn.

What's new

Project-completion suggestion

• New SuggestToPostOnProjectCompletionListener (registered as a checkListener) detects when the whole Hyperskill project lesson becomes solved.
• The dialog is shown only when:
  • the course is a HyperskillCourse in study mode,
  • the solved task belongs to the project lesson and all of its tasks are now solved,
  • the task just transitioned to Solved (it is not shown when re-checking an already-solved task).
• Policy logic lives in SocialMediaUtils.shouldSuggestToPost and is fully covered by tests.

Share dialog

• A modal "Congratulations!" dialog with a selectable/copyable achievement message and a DPI-aware banner image.
• Share on X and Share on LinkedIn buttons open the corresponding web share intents; the dialog stays open so the user can post to both networks.
• Share URLs point to hyperskill.org/courses with the agreed UTM tracking parameters. For X the tracked URL goes in the url intent parameter; for LinkedIn (no url param) it's embedded into the post text.
• A "Don't ask again" checkbox persists the opt-out (even when closing via Cancel).

Settings

• New SocialMediaSettings app-level service (hyperskill.xml) storing the askToPost preference.
• New SocialMediaOptionsProvider settings page lets the user re-enable the suggestion after opting out.

Image rendering

• ScaledBannerIcon keeps the full-resolution source and downscales to the exact device size at paint time using progressive multi-step bicubic scaling, so the banner stays crisp at any DPI. Result is cached per device size.

Build

• New buildAllVersions Gradle task builds the plugin for multiple platform versions (252, 253, 261) in parallel, each in an isolated git worktree, collecting distributions into build/dist-all. Supports -Pversions= and -Pref=.
• Removed the obsolete socialMedia .gif copy step from PrepareSandboxTask; achievement assets are now bundled as resources (project_complete.png).

Testing

• SuggestToPostOnProjectCompletionListenerTest drives the real EP-registered listener through check scenarios, asserting the dialog shows/doesn't show for: full project solved, partial project, non-project task, re-solving a solved task, and the disabled-in-settings case. A mockable SuggestToPostDialogUI is used in unit-test mode.

User-facing strings

New social.media.* keys added to EduCoreBundle.properties (dialog title, share/close buttons, "Don't ask again", achievement message, settings labels).

[meanmail]

Found one issue in the new build helper task.

[meanmail]

Looks good to me. The previous build-task issue is addressed by removing the task.