fix: improve neutral text and search hover contrast

[zeyuyaoy]

max wanted smaller commits :(

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[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Improves color consistency, contrast, and focus visibility across the interface, including dorm banners and search controls.

Changes:

• Adds shared UI color tokens.
• Selects contrasting dorm banner text colors.
• Improves home, search, and keyboard hint styling.

File	Summary
src/​utils/​bannerColors.ts	Computes accessible banner colors.
src/​styles/​home.css	Uses shared accent and focus colors.
src/​styles/​global.css	Defines UI color tokens.
src/​components/​SearchCommand.svelte	Improves hover and selection styling.
src/​components/​Kbd.svelte	Uses the keyboard-text color token.
src/​components/​DormCard.svelte	Applies dynamic banner colors.

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