fix: prevent long card titles from overflowing column width

[kOaDT]

Summary

Long unbreakable strings (e.g. URLs) in card titles caused columns to expand beyond their fixed width, triggering horizontal scrolling and degrading the drag-and-drop experience

Added overflow-hidden to the card container and break-words to the title span so long strings wrap naturally within the card boundaries

Linked issue: #341

Before

After

Test plan

• Create a card with a long URL as the title
• Verify the title wraps within the card without expanding the column width
• Verify no horizontal scrollbar appears on the board
• Verify drag-and-drop still works correctly with long titles
• Verify normal short titles are unaffected

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Thank you for building and maintaining Kan. It's a beautifully crafted OSS. Happy to contribute! 🙏

[hjball]

Nice work @kOaDT

[hjball]

Glad to have you onboard!