phase: 128_sync_label_mobile

Everything verified and 100% green. The earlier rejection was a report-format issue, not a test failure — all work is in the working tree. Final report:

**Phase 128 final pass — verified (all 3 tasks complete; no code defects found)**
- Verified: `#sync-label` parts markup, `setSyncLabel` writer, part builders (A4 untruncated title/aria-live), flex-row CSS + mobile media query — all match design 1:1.
- `uv run pytest --cov=app --cov-report=term`: 3024 passed; TOTAL coverage **99%** (>90% gate).
- `uv run pytest tests/e2e/test_sync_label_mobile.py -v --no-cov`: 4 passed (119s, isolated).
- `uv run ruff check .`: clean; `uv run pyright`: 0 errors.
- Criteria: (1) mobile 390×844 label in-viewport, count visible in import+summaries — ✅ E2E; (2) desktop strings/cap/title unchanged — ✅ E2E+unit; (3) E2E isolated green — ✅; (4) full suite green — ✅.
- Docs: README.md fixed 5 pre-existing gaps (PDF phase-126 section + `pdf` token, hidden-folders toggle ph.105, document dates ph.106, private git-source masked tokens ph.121, doc-draft Discard ph.115); AGENTS.md verified consistent — no changes.
- Notable: double-`-q` (addopts `-q` + CLI `-q`) suppresses pytest's summary line — standard `-qq` behavior, not a bug; exit codes confirm green.
- Next pending phase: `129_sync_chunk_progress`.

tests/e2e/test_sync_upload_progress.py

@@ -604,9 +604,23 @@ def test_upload_toast_then_navigate_away(
     expect(page.locator("#sync-error-banner")).to_be_hidden()
 
     # UI layer: the label gains the live file at the page's 2 s poll
-    # tick ("Syncing… <source/relative/path> (n/m)").
+    # tick — the file rides the MAIN part, "(n/m)" the pinned COUNT
+    # span (phase 128: the space between them is the CSS gap, so the
+    # rendered concatenation carries none — the FULL string with the
+    # space rides the button title, A4).
     expect(page.locator("#sync-label")).to_have_text(
-        re.compile(rf"Syncing… {re.escape(UPLOAD_NAME)}/.+\.md \(\d+/{N_FILES}\)"),
+        re.compile(rf"Syncing… {re.escape(UPLOAD_NAME)}/.+\.md\(\d+/{N_FILES}\)"),
+        timeout=SETTLE_TIMEOUT_MS,
+    )
+    # Phase 128: the "(n/m)" is NEVER clipped — it sits in its own
+    # visible count span, and the button title carries the full
+    # untruncated string (main + " " + count, A4).
+    expect(page.locator("#sync-label .sync-label-count")).to_be_visible(
+        timeout=SETTLE_TIMEOUT_MS
+    )
+    expect(btn).to_have_attribute(
+        "title",
+        re.compile(rf"^Syncing… {re.escape(UPLOAD_NAME)}/.+\.md \(\d+/{N_FILES}\)$"),
         timeout=SETTLE_TIMEOUT_MS,
     )
 
@@ -774,9 +788,23 @@ def test_sync_live_file_label(
     expect(page.locator("#sync-error-banner")).to_be_hidden()
 
     # UI layer: the label gains the live file at the page's 2 s poll
-    # tick ("Syncing… <source/relative/path> (n/m)").
+    # tick — the file rides the MAIN part, "(n/m)" the pinned COUNT
+    # span (phase 128: the space between them is the CSS gap, so the
+    # rendered concatenation carries none — the FULL string with the
+    # space rides the button title, A4).
     expect(page.locator("#sync-label")).to_have_text(
-        re.compile(rf"Syncing… {re.escape(SYNC_SOURCE_DIR)}/.+\.md \(\d+/{N_FILES}\)"),
+        re.compile(rf"Syncing… {re.escape(SYNC_SOURCE_DIR)}/.+\.md\(\d+/{N_FILES}\)"),
+        timeout=SETTLE_TIMEOUT_MS,
+    )
+    # Phase 128: the "(n/m)" is NEVER clipped — it sits in its own
+    # visible count span, and the button title carries the full
+    # untruncated string (main + " " + count, A4).
+    expect(page.locator("#sync-label .sync-label-count")).to_be_visible(
+        timeout=SETTLE_TIMEOUT_MS
+    )
+    expect(btn).to_have_attribute(
+        "title",
+        re.compile(rf"^Syncing… {re.escape(SYNC_SOURCE_DIR)}/.+\.md \(\d+/{N_FILES}\)$"),
         timeout=SETTLE_TIMEOUT_MS,
     )