fix: trim whitespace from parcel name/description and reject blank-only description

[Jakubk15]

Summary

• Fixes Spaces before text in parcel name/description are not being trimmed #219 — parcel name and description are now trimmed before being stored, stripping any leading/trailing spaces the player may have typed
• Fixes It is possible to create a parcel with description consisting of only spaces #220 — a description consisting entirely of spaces is coerced to null (treated as unset) rather than saved as a whitespace-only string

Changes

Both fixes are in SendingGui.java inside the Paper Dialog response callbacks:

• Name: call .trim() on the raw input before passing it to state.parcelName()
• Description: trim the raw input; if the result is blank, store null instead of the whitespace string

Test plan

• Enter a parcel name with leading/trailing spaces (e.g. My Parcel ) — verify it is stored and displayed as My Parcel
• Enter a parcel description with leading/trailing spaces — verify it is trimmed
• Enter a description consisting only of spaces — verify it is treated as unset (description item shows the default "not set" appearance)
• Normal flow: name, description, receiver, destination all set correctly — verify parcel sends successfully

🤖 Generated with Claude Code

https://claude.ai/code/session_01R4YqhTV42FvN95HanC7XJc

[gemini-code-assist]

Code Review

This pull request introduces input trimming for parcel names and descriptions in SendingGui.java to prevent leading or trailing whitespace. A review comment suggests simplifying the parcel description handling logic by using String#isBlank() to check for null or whitespace-only strings, which would make the code cleaner and more concise.

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[gemini-code-assist]

This logic can be simplified by leveraging String#isBlank() (which is already used in this class) to check if the description is null or whitespace-only, and then directly assigning the trimmed value or null.

Suggested change

	String trimmedDescription = description != null ? description.trim() : null;
	this.state.parcelDescription(description);
	this.state.parcelDescription(trimmedDescription == null || trimmedDescription.isEmpty() ? null : trimmedDescription);
	String trimmedDescription = (description == null || description.isBlank()) ? null : description.trim();
	this.state.parcelDescription(trimmedDescription);