feat: add server icon, edit link, and permanent tabs to plugin updater

[saboooor]

Summary

Follow-up to #245 (already merged) — restores a few UI refinements from the pre-revert plugin-store work (fbe520b..71d1368) that never made it back in:

• Icon in tab: getUserServers now pings each server via getServerStatus and returns its live favicon; tabs show that icon (or a Globe fallback) via the before-${tab} slot.
• Permanent tabs: tabs backed by a real linked server (serverId set) get permanent: true in the Tabs values, hiding the delete button so a linked tab can't be accidentally removed. permanent is an existing, supported prop on the installed @luminescent/ui-qwik Tabs component.
• External link to server: linked tabs get an ExternalLink button in the after-${tab} slot, opening that server's edit page.
• Export button padding: lum-btn-p-2 → lum-btn-p-1, matching the rest of the toolbar row.

These were adapted rather than copied verbatim from history: the original reference commit imported PluginsStoreType/ServerType without type (the exact bug that got the whole feature reverted originally — see #245), and linked to a /dashboard/servers/:slug path that no longer exists. This version keeps the import type fix and points the external link at the current /serverlist/:slug/edit route instead.

Test plan

• vp install && vp dev, open /resources/plugins while logged in with an owned Server List listing
• Confirm the tab shows the server's favicon (or Globe if unreachable)
• Confirm the linked tab has no delete ("x") button
• Confirm the external-link button on the tab opens /serverlist/:slug/edit
• Confirm the Export button's padding matches the other toolbar buttons

🤖 Generated with Claude Code

https://claude.ai/code/session_01CCYKYic3u8tJS2REWSZUnR

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[Copilot]

Pull request overview

Restores several UX refinements to the Plugin Updates page by enriching owned Server List tabs with live server icons, preventing accidental deletion of linked tabs, and adding a quick navigation link to manage the linked listing.

Changes:

• getUserServers now resolves each owned listing’s live status (cached) and returns a favicon-derived icon for UI display.
• Plugin tabs now render a per-tab icon (favicon or Globe fallback), mark linked tabs as permanent, and show an external-link button to /serverlist/:slug/edit.
• Adjusts Export button padding to align with the rest of the toolbar.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/util/serverlist/actions.ts	Enriches getUserServers results by fetching/caching live status and returning an icon field for each owned listing.
src/routes/resources/plugins/index.tsx	Updates Tabs rendering to show server icons, make linked tabs non-deletable, add a manage-link button, and tweak Export button padding.

Suppressed comments (2)

src/routes/resources/plugins/index.tsx:354

• This Globe fallback also uses the array index as its key, which can lead to incorrect DOM reuse when the tab list changes. Prefer a stable key based on the tab value/name.

              <Globe q:slot={`before-${k}`} key={i} size={14} class="shrink-0" />

src/routes/resources/plugins/index.tsx:359

• The external-link button uses an index-based key; if tabs are reordered/removed this can cause the wrong link element to be reused. Use a stable key based on the tab name.

                    key={`link-${i}`}