feat: add SSE URL construction and connection management

test/noise-sse-test.el

@@ -9,6 +9,9 @@
 (require 'ert)
 (require 'noise-sse)
 
+(defvar noise-signal-cli-address)
+(defvar noise-account)
+
 (ert-deftest noise-sse--parse-event-basic ()
   "Parse a basic SSE event with data field."
   (let ((event "data: {\"type\":\"message\",\"content\":\"hello\"}\n\n"))
@@ -76,5 +79,21 @@
         (noise-sse--filter nil "}\n\n")
         (should (= 1 (length processed-events)))))))
 
+(ert-deftest noise-sse--build-url ()
+  "Build SSE endpoint URL from base address."
+  (let ((noise-signal-cli-address "http://localhost:8080")
+        (noise-account "+15551234567"))
+    (let ((url (noise-sse--build-url)))
+      (should (string-match-p "/api/v1/events" url))
+      (should (string-match-p "account=%2B15551234567" url)))))
+
+(ert-deftest noise-sse--build-url-no-account ()
+  "Build SSE endpoint URL without account parameter."
+  (let ((noise-signal-cli-address "http://localhost:8080")
+        (noise-account nil))
+    (let ((url (noise-sse--build-url)))
+      (should (string-match-p "/api/v1/events" url))
+      (should-not (string-match-p "account=" url)))))
+
 (provide 'noise-sse-test)
 ;;; noise-sse-test.el ends here