Fix/macos launcher and splash

[itsBOTzilla]

Summary

Two small launcher-path fixes that affect anyone running Microbot from source on macOS.

1. macOS IllegalAccessError at startup

OSXFullScreenAdapter extends com.apple.eawt.FullScreenAdapter, which lives in a sealed JDK
module. On JDK 17+ the module system rejects the subclass at class-load time:

java.lang.IllegalAccessError: superclass access check failed:
class net.runelite.client.ui.OSXFullScreenAdapter ...

Fix: add --add-opens/--add-exports for java.desktop/com.apple.eawt(.event) to the run,
runDebug, and runTest Gradle tasks, plus matching Add-Opens/Add-Exports attributes on
the shaded-jar manifest so java -jar launches also work.

2. SplashScreen UX

• action, subAction, and the error-summary label become non-editable
  JTextField/JTextArea so users can highlight and copy them (helpful when reporting a startup
  failure).
• The "Did you know?" fact area is made focusable for the same reason.
• The undecorated frame now has a press/drag mouse listener on the root panel and logo, so it
  can be moved out of the way during long downloads.
• HTML wrapping on the error summary is removed since JTextArea handles wrapping natively.

Test plan

• ./gradlew :client:run on macOS (JDK 17) — splash + client open without
  IllegalAccessError.
• Splash window: action/subAction/error text is selectable; clicking-and-dragging the
  splash moves it.
• ./gradlew :client:compileJava clean.
• (Reviewer) Verify no regression on Linux/Windows where the eawt flags are ignored.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 42792fa7-0c18-4d13-954b-da4ad4e0eda3

📥 Commits

Reviewing files that changed from the base of the PR and between 0a44224 and 876c8ff.

📒 Files selected for processing (2)

• runelite-client/build.gradle.kts
• runelite-client/src/main/java/net/runelite/client/ui/SplashScreen.java

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Walkthrough

This PR modifies the RuneLite client build configuration and splash screen UI. The build configuration now exposes Java module access for macOS's com.apple.eawt packages by adding --add-opens and --add-exports flags to development and testing tasks as well as to the packaged JAR manifest. The SplashScreen UI refactors text display components to support text selection and copying by replacing non-selectable labels with transparent, non-editable text fields and text areas. A new window drag handler enables window movement in the undecorated splash frame. Error text rendering switches from HTML markup to plain text, relying on native text component wrapping.

Possibly related PRs

• chsami/Microbot#1570: Both PRs modify SplashScreen error rendering, with the main PR converting error display to plain-text selectable components that directly support crash-details display features.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 8.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main changes: macOS launcher fixes and splash screen improvements, matching the primary objectives of the pull request.
Description check	✅ Passed	The description provides comprehensive detail on both changes (macOS IllegalAccessError fix and splash screen UX improvements), directly aligned with the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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