Milestone 1 Cleanup / Edge-Cases

[riyashenoy]

• Empty name: leave the name blank on CreateJournal, click Begin. Should default to "untitled journal", check the Library slot shows that text.
• Long name: type something like "my incredible amazing journey through the coffee shop on a rainy tuesday afternoon". Check the slot doesn't break. If it overflows: click the NameText in your slot, go to the TMP_Text component, set Overflow → Ellipsis. This adds "..." when text is too long.
• Max journals: create journals until all 6 are filled. All "+" slots should be gone. No 7th slot should appear. No errors.
• Same name twice: create two journals both named "test". Both should appear as separate slots (they have different IDs even with the same name).