fix(dashboard): rewrite Functions and Packages pages with valid syntax

Both pages had multiple JS syntax errors in `<script server>` blocks
(missing `)` on `Array.from(…)`, `.map(…)`, `toLocaleDateString(…)`)
plus unsupported Vue constructs (`<Listbox>`, `<transition>`,
`<component :is>`, `v-slot`, `@keyup.enter`) that prevented either
page from rendering.

Rewrote both with the same patterns now used by Dependencies and
Health: PageHeader / Card / Button / Badge / EmptyState components,
inline-SVG icons (no UnoCSS-class dependency), and clean STX syntax
(@foreach…@Endforeach, plain `class="…"`).

Functions page: 4 placeholder rows from `resources/functions/`, a
3-card stats overview (total / active / draft), status badges.

Packages page: 12 stacks-org packages, 4-card stats overview
(packages / downloads / contributors / issues), download-volume
badges that switch variant at 10k / 100k thresholds.

Both files balance cleanly: 1 @foreach / 1 @if / 1 @else.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: chrisbbreuer