fix FT note→post renames in test_sharing & test_layout_and_styling; note page layout polish

- test_sharing.py: NotePage→PostPage, MyNotesPage→MyPostsPage, add_note_item→add_post_line,
  share_note_with→share_post_with, get_note_owner→get_post_owner; navigate to /billboard/
- test_layout_and_styling.py: NotePage→PostPage, get_item_input_box→get_line_input_box,
  add_note_item→add_post_line; navigate to /billboard/
- my_notes.html: remove "My Notes" h2 heading
- _note.scss: .note-page padding 0.75rem 1.5rem; .note-don-doff top:-1rem (DON centers on
  corner), gap:0.4rem (tight like game kit); .note-item padding-left:1.25rem (left buffer)

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/functional_tests/test_layout_and_styling.py

@@ -1,12 +1,12 @@
 from .base import FunctionalTest
-from .note_page import NotePage
+from .post_page import PostPage
 
 
 class LayoutAndStylingTest(FunctionalTest):
     def test_layout_and_styling(self):
         self.create_pre_authenticated_session("disco@test.io")
-        self.browser.get(self.live_server_url)
-        note_page = NotePage(self)
+        self.browser.get(self.live_server_url + '/billboard/')
+        post_page = PostPage(self)
 
         self.browser.set_window_size(1024, 768)
 
@@ -27,11 +27,11 @@ class LayoutAndStylingTest(FunctionalTest):
                 return [r.x + r.width / 2, s.x + pl + (s.width - pl - pr) / 2];
             """, el)
 
-        inputbox = note_page.get_item_input_box()
+        inputbox = post_page.get_line_input_box()
         input_c, section_c = section_center(inputbox)
         self.assertAlmostEqual(input_c, section_c, delta=10)
 
-        note_page.add_note_item("testing")
-        inputbox = note_page.get_item_input_box()
+        post_page.add_post_line("testing")
+        inputbox = post_page.get_line_input_box()
         input_c, section_c = section_center(inputbox)
         self.assertAlmostEqual(input_c, section_c, delta=10)