test(sveta): Extend vote-state tests to assert the non-color cue

Outcome: done
Changed: tests/conftest.py:293-300, tests/e2e/post.py:5,74-157, tests/e2e/posts/index.py:17,396-418, tests/e2e/notifications/index.py:313,799, tests/e2e/leaderboard.py:42
Verified by: python -m pytest tests/e2e/post.py tests/e2e/posts/index.py tests/e2e/notifications/index.py tests/e2e/leaderboard.py -> 68 passed (verify() passed); make test full suite -> 3344 passed, 1 skipped, 10 failed (9x tests/api/projects/workspace.py: docker binary absent in this environment, same as prior sibling run; 1x tests/e2e/game/farm.py::test_victim_notification_names_the_raider_and_the_amount, passes standalone and 9/9 in its file, game code has no vote markup)
Findings: New vote_glyph helper (tests/conftest.py:293) reads getComputedStyle(el,'::before').content and normalizes CSS escapes; glyph assertions cover post upvote (+ -> U+2295), post downvote (U+2212 -> U+2296), and comment upvote (+ -> U+2295), each also asserting unvoted glyph absence and toggle-off restoration to the unvoted glyph. New test fails against pre-change code: on 72e11db, test_post_upvote_voted_state_persists fails with "assert 'none' == '+'" (no ::before rule existed; buttons held literal text). Fixed all three has_text="+" vote locators (notifications/index.py:313,799, leaderboard.py:42) to class-based button.post-action-btn.vote-up; the three tests now pass. test_comment_voted_state_persists was made deterministic by wrapping the click in expect_response (pre-existing reload race); it now passes reliably

Typosaurus-Run: c36faeceb55d45b6bf38a45eec4f47ab
Typosaurus-Node: 9b6a5ec294a2472e800fbfeed775b27b
Typosaurus-Agent: @sveta
Refs: #162

tests/e2e/notifications/index.py

@@ -310,7 +310,7 @@ def test_vote_notification_on_post(app_server, browser, seeded_db):
 
     pa.goto(post_url, wait_until="domcontentloaded")
     pa.wait_for_timeout(1000)
-    vote_btn = pa.locator("button.post-action-btn").filter(has_text="+").first
+    vote_btn = pa.locator("button.post-action-btn.vote-up").first
     vote_btn.wait_for(state="visible", timeout=10000)
     vote_btn.click()
     pa.wait_for_timeout(1500)
@@ -796,7 +796,7 @@ def test_vote_notification_click_opens_target(app_server, browser, seeded_db):
 
     pa.goto(f"{BASE_URL}{post_path}", wait_until="domcontentloaded")
     pa.wait_for_timeout(1000)
-    vote_btn = pa.locator("button.post-action-btn").filter(has_text="+").first
+    vote_btn = pa.locator("button.post-action-btn.vote-up").first
     vote_btn.wait_for(state="visible", timeout=10000)
     vote_btn.click()
     pa.wait_for_timeout(1500)