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_summary_visibility.py

@@ -71,12 +71,13 @@ Test → observable mapping (Playwright Mapping Rule):
    summaries_total == 3`` (the keep-final-counts convention).
 2. ``test_sync_button_names_the_summary_phase`` (UI — the slow leg):
    a fresh admin page on ``/sources.html`` clicks **Sync sources**;
-   the page's OWN 2 s poll renders ``#sync-label`` matching
-   ``Summarizing folders… [folder] (n/3)`` (the asserted text is the
-   RENDERED DOM label, with the button ``title`` riding the same
-   untruncated value — A4); on settle the button reads the terminal
-   ``Synced HH:MM`` (the phase-32 contract) and ``#sync-result``
-   carries the counts line.
+   the page's OWN 2 s poll renders ``#sync-label`` as the D2 PARTS
+   (phase 128: the main part ``Summarizing folders… [folder]`` + the
+   pinned count part ``(n/3)`` — the asserted text is the RENDERED
+   DOM parts, with the button ``title`` riding the full untruncated
+   string, main + " " + count — A4); on settle the button reads the
+   terminal ``Synced HH:MM`` (the phase-32 contract) and
+   ``#sync-result`` carries the counts line.
 3. ``test_missing_folder_summaries_read_as_pending_and_self_heal``
    (tree — the fast mock leg): after a successful sync (every
    candidate stores its canned line) NO marker is anywhere; DELETE
@@ -727,13 +728,15 @@ def test_sync_button_names_the_summary_phase(
 ) -> None:
     """A fresh admin page on ``/sources.html`` clicks **Sync sources**;
     the page's OWN 2 s poll renders ``#sync-label`` as
-    ``Summarizing folders… [source/folder] (n/3)`` (asserted on the
-    RENDERED text — the label is built by the page JS — with the
-    button ``title`` carrying the same untruncated value, A4); on
-    settle the button shows the terminal ``Synced HH:MM`` (the
-    phase-32 contract) and ``#sync-result`` carries the counts line.
-    The prelude/import labels stay the phase-64 shape (the endpoint
-    test pins those phases; the UI pins the new summaries label)."""
+    ``Summarizing folders… [source/folder]`` + the pinned ``(n/3)``
+    count span (phase 128: the label is PARTS — the folder part is
+    optional — the phase's first poll may precede the first hook — and
+    the button ``title`` carries the full untruncated string, main +
+    " " + count, A4); on settle the button shows the terminal
+    ``Synced HH:MM`` (the phase-32 contract) and ``#sync-result``
+    carries the counts line. The prelude/import labels stay the
+    phase-64 shape (the endpoint test pins those phases; the UI pins
+    the new summaries label)."""
     page.set_default_timeout(30_000)
     _register_source(app_url, str(syncsum_dir))
     login(page, app_url)  # lands on /sources.html (the button's home)
@@ -764,22 +767,30 @@ def test_sync_button_names_the_summary_phase(
     expect(page.locator("#sync-error-banner")).to_be_hidden()
 
     # UI layer (D2): the page's own 2 s poll names the summaries phase
-    # — the RENDERED label matches the D2 shape (the folder part is
-    # optional — the phase's first poll may precede the first hook)
-    # with the (n/3) counts, and the button ``title`` carries the same
-    # untruncated value (A4). ``wait_for_function`` checks BOTH in ONE
-    # in-browser evaluation: a poll tick updates label + title together
-    # in a single JS task, so the atomic check can never straddle one
-    # (the JS regex is the D2 shape, unit-pinned in
-    # tests/unit/test_frontend_sync_upload.py).
+    # — the RENDERED label matches the D2 PARTS shape (phase 128:
+    # the MAIN part carries "Summarizing folders… [folder]" — the
+    # folder part is optional, the phase's first poll may precede the
+    # first hook — and the pinned COUNT part carries the (n/3)
+    # counts), and the button ``title`` carries the full untruncated
+    # string (main + " " + count, A4). ``wait_for_function`` checks
+    # BOTH in ONE in-browser evaluation: a poll tick updates the parts
+    # + the title together in a single JS task, so the atomic check
+    # can never straddle one (the JS regexes are the D2 shapes,
+    # unit-pinned in tests/unit/test_frontend_sync_upload.py).
     page.wait_for_function(
         """() => {
             const label = document.querySelector('#sync-label');
             const btn = document.querySelector('#sync-btn');
             if (!label || !btn) return false;
-            const text = label.textContent;
-            const re = /^Summarizing folders…(?: \\S+)? \\(\\d+\\/3\\)$/;
-            return re.test(text) && btn.getAttribute('title') === text;
+            const main = label.querySelector('.sync-label-main');
+            const count = label.querySelector('.sync-label-count');
+            if (!main || !count || count.hidden) return false;
+            const reMain = /^Summarizing folders…(?: \\S+)?$/;
+            const reCount = /^\\(\\d+\\/3\\)$/;
+            return reMain.test(main.textContent)
+                && reCount.test(count.textContent)
+                && btn.getAttribute('title')
+                    === main.textContent + ' ' + count.textContent;
         }""",
         timeout=SETTLE_TIMEOUT_MS,
     )