fix(desktop): connect pills reload tools into the session that clicked them

Both connect providers captured `sessionId` when the suggestion was built
and ignored the one the pill hands `invoke`. An offer that outlived a
session switch therefore aimed its `reload.mcp` at the session the draft was
sampled in, so the chat the user actually clicked from resumed without the
tools the pill just said were ready.

Prefer the invoking pill's session; the captured one stays as the fallback.

apps/desktop/src/store/suggestion-providers/mcp.ts

@@ -186,7 +186,9 @@ function toSuggestion(match: McpMatch, sessionId: string | null): ComposerSugges
     doneLabel: copy('added', name),
     doneTip: copy('addedTip'),
     id: match.server,
-    invoke: context => connect(match.server, sessionId, context.cancelled),
+    // The pill's session wins over the one captured at sample time: the reload
+    // has to reach the session the user is actually looking at.
+    invoke: context => connect(match.server, context.sessionId ?? sessionId, context.cancelled),
     label: copy('label', name),
     provider: 'mcp',
     tip: copy('tip', match.keyword),

apps/desktop/src/store/suggestion-providers/repair.ts

@@ -73,7 +73,7 @@ function toSuggestion(server: string, sessionId: string | null): ComposerSuggest
     doneTip: copy('doneTip'),
     icon: 'plug',
     id: server,
-    invoke: context => reconnect(server, sessionId, context.cancelled),
+    invoke: context => reconnect(server, context.sessionId ?? sessionId, context.cancelled),
     label: copy('label', name),
     provider: 'repair',
     tip: copy('tip', name),