Minor Dialog and dropdown style tweaks

[netchampfaris]

Two small styling tweaks:

• Dialog: title is now text-2xl-semibold / text-ink-gray-8 (was text-3xl-semibold / text-ink-gray-9) — smaller and softer.
• Menu (dropdown): highlighted item background uses surface-alpha-gray-2 instead of surface-gray-2.

🤖 Generated with Claude Code

Docs preview: https://ui.frappe.io/pr-preview/pr-797/

Coverage: 57.15% (±0.00% vs main)

[barista-for-frappe]

Looks good — two cosmetic token tweaks, no public API change.

• Dialog.vue:78 — smaller/softer title (text-2xl-semibold / text-ink-gray-8); both tokens are used elsewhere (e.g. Card.vue:8).
• Menu/utils.ts:162 — highlighted item now uses surface-alpha-gray-2; confirmed it's a real semantic token (surface-alpha/gray-2 → gray-alpha.100). Safe.

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