feat(frontend): finish fundamentals reference rails

docs/dolt-integration-plan.md

@@ -109,12 +109,12 @@ reviewed separately if B begins.
   share count — both consumers (est. market cap, YoY dilution) want a
   point-in-time value. **Nothing
   derived is frozen into a row:** discrete quarters (10-Q YTD deltas, Q4 = FY −
-  Q1..Q3), TTM, YoY and the quarter-tape series are all computed **at read time** by
+  Q1..Q3), TTM, YoY and the four-period metric histories are all computed **at read time** by
   picking the newest valid accepted_at snapshot for *each* required period — so
   non-calendar fiscal years resolve correctly and a later amendment to a prior
   quarter is reflected automatically without ever storing a stale derived quarter.
   Readers pick the newest valid accepted_at per period; history powers the UI
-  quarter tape.
+  reference comparisons and deterministic reads.
 - Keep `fundamental_data` (`app/models/fundamental.py`) as the latest-value compat
   cache, repopulated by the daily SEC job — but only after the phase-A5 parity
   gate.
@@ -336,37 +336,41 @@ changes.
 
 ## UI — `frontend/src/components/ticker/FundamentalsPanel.tsx`
 
-One distinctive visual device — the **quarter tape** — in an otherwise restrained
+One distinctive visual device — the **Reference Rails** — in an otherwise restrained
 panel. Preserve the app's dark glass styling and numeric typography.
 
 ```
-Fundamentals                     Quality improving · valuation rich
-Next earnings  Aug 3 · AMC       Last 4:  beat  beat  miss  beat
+Fundamentals
+Growth accelerating · margins improving · valuation priced above peers
+Next earnings  Aug 3 · AMC       EPS surprises  ▂ ▅ ▃ ▆
 
-Quarter tape          Q−3    Q−2    Q−1    Latest      Read
-Revenue growth         8%     11%    15%     18%       accelerating
-Operating margin      19%     20%    20%     22%       improving
-FCF margin            12%     10%    14%     16%       above own average
-Share count change                                     1.8% dilution
+Operating trend              less favorable ← ref → more favorable
+Revenue growth                                             18%
+───────────────│━━━━●                   +3pp vs prior · accelerating
+Share count YoY                                           −1.7%
+───────────────│━━━━●                                    buying back
 
-Balance & valuation
-Net debt / EBITDA      1.4×      Industry median 2.1×   healthy leverage
-P/E                   29.2×      Industry median 23.5×  priced above peers
-FCF yield              3.8%      Industry median 3.1%   above peers
+Valuation & balance           less favorable ← median → more favorable
+P/E                                                       29.2×
+────●━━━━━━━━━━│────                  priced above peers · median 23.5× · 12 peers
 ```
 
-- Growth, margins, share count: latest four periods as a compact four-cell tape
-  (or sparkline) plus a deterministic text read (rules below).
-- P/E, FCF yield, leverage: horizontal industry-percentile strip with a median
-  marker. Hidden entirely when `industry` is null (< 5 peer issuers).
-- Earnings: four bars around a zero baseline — green beats, red misses, gray
+- Growth and margins: horizontal rails compare the latest value with the prior
+  quarter or prior-period average; share-count YoY compares with zero. The rail
+  is normalized so right is always more favorable, including buybacks.
+- P/E, FCF yield and leverage: horizontal favorable-percentile rails with a
+  peer-median marker. No decorative rail when `industry` is null (< 5 peers).
+- Every row keeps the exact value and one deterministic comparison caption;
+  missing values render `n/a`, and insufficient peers render `peers n/a`.
+- Earnings: four bars around a shared zero baseline — cyan beats, coral misses, gray
   unavailable — plus next date and BMO/AMC session countdown.
-- Accessibility: color always paired with text or arrows; neutral/ambiguous stays
-  gray; green/red only when a read is genuinely favorable/adverse.
-- Remove the hard-coded "FMP" source label — provenance is per metric.
+- Accessibility: color is always paired with text; neutral/ambiguous stays gray;
+  rails and earnings bars expose complete ARIA descriptions.
+- Remove the hard-coded "FMP" source label; surface filing and price-date
+  provenance in the footer.
 
 **Deterministic reads — one shared rule set.** Implement as a single function with
-named constants; the tape reads and the header sentence use identical outputs. No
+named constants; the metric reads and the header sentence use identical outputs. No
 LLM, no new composite score. Defaults (tunable constants, not scattered literals):
 
 - A series read requires ≥ 3 periods; otherwise show "—" and no read.