rename: Note→Post/Line (dashboard); Recognition→Note (drama); new-post/my-posts to billboard

- dashboard: Note→Post, Item→Line across models, forms, views, API, urls & tests
- new-post (9×3) & my-posts (3×3) applets migrate from dashboard→billboard context; billboard view passes form & recent_posts
- drama: Recognition→Note, related_name notes; billboard URL /recognition/→/my-notes/, set-palette at /note/<slug>/set-palette
- recognition.js→note.js (module Note, data.note key); recognition-page.js→note-page.js; .recog-*→.note-*
- _recognition.scss→_note.scss; BillNotes page header; applet slug billboard-recognition→billboard-notes (My Notes)
- NoteSpec.js replaces RecognitionSpec.js; test_recognition.py→test_applet_my_notes.py
- 4 migrations applied: dashboard 0004, applets 0011+0012, drama 0005; 683 ITs green

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/functional_tests/test_applet_new_post_line_validation.py

@@ -0,0 +1,80 @@
+from selenium.webdriver.common.by import By
+from selenium.webdriver.common.keys import Keys
+
+from .base import FunctionalTest
+from .post_page import PostPage
+
+
+class LineValidationTest(FunctionalTest):
+    # Helper functions
+    def get_error_element(self):
+        return self.browser.find_element(By.CSS_SELECTOR, ".invalid-feedback")
+
+    # Test methods
+    def test_cannot_add_empty_post_lines(self):
+        self.create_pre_authenticated_session("disco@test.io")
+        self.browser.get(self.live_server_url + '/billboard/')
+        post_page = PostPage(self)
+        post_page.get_line_input_box().send_keys(Keys.ENTER)
+
+        self.wait_for(
+            lambda: self.browser.find_element(By.CSS_SELECTOR, "#id_text:invalid")
+        )
+
+        post_page.get_line_input_box().send_keys("Purchase milk")
+        self.wait_for(
+            lambda: self.browser.find_element(By.CSS_SELECTOR, "#id_text:valid")
+        )
+
+        post_page.get_line_input_box().send_keys(Keys.ENTER)
+        post_page.wait_for_row_in_post_table("Purchase milk", 1)
+
+        post_page.get_line_input_box().send_keys(Keys.ENTER)
+
+        post_page.wait_for_row_in_post_table("Purchase milk", 1)
+        self.wait_for(
+            lambda: self.browser.find_element(By.CSS_SELECTOR, "#id_text:invalid")
+        )
+
+        post_page.get_line_input_box().send_keys("Make tea")
+        self.wait_for(
+            lambda: self.browser.find_element(
+                By.CSS_SELECTOR,
+                "#id_text:valid",
+            )
+        )
+        post_page.get_line_input_box().send_keys(Keys.ENTER)
+        post_page.wait_for_row_in_post_table("Make tea", 2)
+
+    def test_cannot_add_duplicate_lines(self):
+        self.create_pre_authenticated_session("disco@test.io")
+        self.browser.get(self.live_server_url + '/billboard/')
+        post_page = PostPage(self)
+        post_page.add_post_line("Witness divinity")
+
+        post_page.get_line_input_box().send_keys("Witness divinity")
+        post_page.get_line_input_box().send_keys(Keys.ENTER)
+
+        self.wait_for(
+            lambda: self.assertEqual(
+                self.get_error_element().text,
+                "You've already logged this to your post",
+            )
+        )
+
+    def test_error_messages_are_cleared_on_input(self):
+        self.create_pre_authenticated_session("disco@test.io")
+        self.browser.get(self.live_server_url + '/billboard/')
+        post_page = PostPage(self)
+        post_page.add_post_line("Gobbledygook")
+        post_page.get_line_input_box().send_keys("Gobbledygook")
+        post_page.get_line_input_box().send_keys(Keys.ENTER)
+        self.wait_for(
+            lambda: self.assertTrue(self.get_error_element().is_displayed())
+        )
+
+        post_page.get_line_input_box().send_keys("a")
+
+        self.wait_for(
+            lambda: self.assertFalse(self.get_error_element().is_displayed())
+        )