feat(ui): Contribute / Request affordances wired to registry templates - #148

Summary

Adds end-to-end Contribute / Request affordances across the app and wires them to the issue templates that just landed in mcpmux/mcp-servers (see merged PR #114 there).

Users who hit a dead-end — searched for a server that isn't in the registry, found a bug, wanted to suggest a feature — had no clear in-app path. This PR gives them three coordinated entry points, all opening the user's default browser via the Tauri opener plugin (no in-webview navigation).

What's new

New shared module — lib/contribute.ts

Centralises every external URL (main repo, servers repo, bug/feature/request-server templates). CONTRIBUTE.requestServer(searchTerm?) URL-encodes the search term into the GitHub issue title so a user arriving from the empty-search state lands on a pre-populated form. openExternal(url) wraps openUrl with the same opener-plugin fallback OAuthConsentModal uses.

New shared components — components/Contribute.tsx

• <RequestServerCTA searchTerm?> — inline gradient card used on empty-search states. Two-button footer: Request (opens the request-server.yml template with the search term as the title) + Contribute (opens mcp-servers CONTRIBUTING.md).
• <ContributeMenu> — dropdown with Request new server / Report bug / Suggest feature / Open on GitHub. Reusable anywhere; lives in the Registry header today.

Placements

• Registry page — <ContributeMenu> in the header (always visible). <RequestServerCTA> in the empty-results state with the active searchQuery threaded into the issue title.
• Add Custom Server modal (ConfigEditorModal) — <RequestServerCTA> above the Monaco editor. Users about to hand-roll a custom server config see a clear nudge to check whether one already exists upstream.
• Settings — new "Contribute & feedback" card with a 2-column grid of Request-server / Report-bug / Suggest-feature / Open-on-GitHub tiles (ContributeRow helper local to SettingsPage.tsx).

Issue-template wiring

Every link that previously used ?labels= params now uses ?template=*.yml so it opens the correct pre-filled GitHub issue form:

.github/ISSUE_TEMPLATE/config.yml

• Enables blank issues.
• Adds three cross-repo contact links surfacing the registry's PR guide, Request-a-Server template, and Report-a-Bug template in the "New issue" chooser. Avoids cross-repo ticket drift — users who accidentally come to mcp-mux to report a registry issue see exactly where to go.

Commit layout

1. feat(ui): Contribute / Request affordances across the app — the module + components + Registry/Settings placements (originally a local-only commit on my machine).
2. feat(ui): wire Contribute/Request affordances to merged registry templates — template URL switch + ConfigEditorModal CTA placement + config.yml contact links + blank-issues toggle.

Test plan

• pnpm typecheck — passes locally
• pnpm lint — no new warnings
• Launch pnpm dev, exercise each affordance:
  • Registry header Contribute dropdown → each menu item opens the right GitHub template
  • Empty-search state on Registry → Request/Contribute buttons open the right URLs with search term pre-filled on the title
  • Add Custom Server modal → Request/Contribute CTA renders above the editor
  • Settings → "Contribute & feedback" card renders with 4 tiles, each opens the correct URL
• Verify on GitHub that the "New issue" chooser for this repo shows the new contact links and the "Open a blank issue" option
• Check that request-server.yml / bug-report.yml deep links on mcp-servers resolve (they ship as part of the already-merged mcp-servers PR chore: add MCP Registry server.json and gitignore updates #114)