fix: improve dorm label contrast

[zeyuyaoy]

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[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review issues remain.

Review effort: Lite
Findings: None

What changed in this PR

Improves dorm banner readability by selecting accessible text colors based on background luminance.

Changes:

• Adds validated color and luminance utilities.
• Applies dynamic banner background and foreground colors.

File	Description
src/​utils/​bannerColors.ts	Computes accessible banner foreground colors.
src/​components/​DormCard.svelte	Applies computed banner colors.

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