feat: show startup crash details on splash screen

[chsami]

Summary

• add a CrashReportFormatter helper and expose crash details via FatalErrorDialog copy buttons
• surface startup failures on the splash screen with an error card and clipboard-friendly copy action

Testing

• ⚠️ mvn -pl runelite-client -DskipTests compile (fails: unable to download com.google.inject:guice-bom:4.1.0 due to HTTP 403)

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https://chatgpt.com/codex/tasks/task_e_68f06d7cf3bc83289fcd48cebf149198

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Walkthrough

This change adds centralized crash formatting via CrashReportFormatter and integrates it into startup error handling for RuneLite and RuneLiteDebug. On exceptions during startup, the code now generates a crash summary and details, shows them on the SplashScreen using a new SplashScreen.showError API if the splash is active, or via a FatalErrorDialog otherwise. SplashScreen gains an error card with copy-to-clipboard support and avoids progress updates while showing errors. FatalErrorDialog now supports dynamic content updates and copy buttons. SplashScreen.stop is skipped when startup fails. No public signatures were removed.

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The pull request title "feat: show startup crash details on splash screen" directly aligns with the primary objective and main change in the changeset. The title is concise, clear, and accurately summarizes the core functionality being added: displaying startup crash details on the splash screen. The changes across RuneLite.java, RuneLiteDebug.java, SplashScreen.java, FatalErrorDialog.java, and the new CrashReportFormatter.java all work cohesively to implement this feature, making the title both specific and representative of the changeset.
Description Check	✅ Passed	The pull request description is clearly related to the changeset and provides meaningful information about the changes. It accurately describes the two main components: adding a CrashReportFormatter helper utility and surfacing startup failures on the splash screen with copy functionality. Each point in the description is directly reflected in the raw_summary, from the new utility class to the FatalErrorDialog enhancements and the SplashScreen.showError() API addition.

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