Expand App Intents: dialogs, search type, mutating intents (#17)

Addresses the three open items on the App Intents ticket:

- Check Status / Check Builds now return a spoken/visible dialog alongside
  their value, so they surface a result in Siri instead of appearing to do
  nothing. Logic consolidated to always produce a message.
- Search Hutch gains a Search Type parameter (user, git/hg repo, mailing
  list, tracker, build job) threaded through the .search route into Lookup,
  which pre-selects the type. LookupType now conforms to AppEnum.
- Adds mutating intents (not just navigation): Clear Recent Activity and
  Unpin Resource, backed by RecentActivityStore.clear and a new
  HomePinStore.removePin. Both act on the active account's storage.

Tests cover search-type routing, the blank-query fallback, and pin removal.

1 files changed, 15 insertions, 0 deletions

diff --git a/Hutch/Views/Home/HomePinStore.swift b/Hutch/Views/Home/HomePinStore.swift
index e9bffd1..3b00843 100644
--- a/Hutch/Views/Home/HomePinStore.swift
+++ b/Hutch/Views/Home/HomePinStore.swift
@@ -144,6 +144,21 @@ enum HomePinStore {
         saveAll(pinsByUser, defaults: defaults)
     }
 
+    static func removePin(
+        id: String,
+        for userKey: String,
+        defaults: UserDefaults = .standard
+    ) {
+        let normalizedUserKey = normalizedUserKey(userKey)
+        guard !normalizedUserKey.isEmpty else { return }
+
+        var pinsByUser = loadAll(defaults: defaults)
+        var pins = normalizedPins(pinsByUser[normalizedUserKey] ?? loadPins(for: normalizedUserKey, defaults: defaults))
+        pins.removeAll { $0.id == id }
+        pinsByUser[normalizedUserKey] = pins
+        saveAll(pinsByUser, defaults: defaults)
+    }
+
     static func pinnedProjectIDs(
         for userKey: String,
         defaults: UserDefaults = .standard