feat(scroll): report a panel that cannot reach its refresh cap, and suggest one it can hold (#759)

* feat(scroll): report a panel that cannot reach its refresh cap, and suggest one it can hold

Scroll speeds are solved against display.hardware.limit_refresh_rate_hz,
which is only a ceiling. A panel that cannot reach it still moves whole
pixels per frame, but every scroll runs slow by the shortfall and the
"smooth" ladder is the cap's, not the panel's. A user rig (Pi 4, 2x128x64,
adafruit-hat-pwm, pwm_bits 9, gpio_slowdown 5) measured 107.6-113.1 Hz under
a 120 Hz cap: 60 px/s ran at 55, and nothing said why.

- scroll_config: refresh_shortfall() (more than 3% under the planned rate),
  holdable_cap() (a multiple of 10, 5% under the measurement, since the
  measurement is the fast end of an uncapped panel's drift), and
  describe_refresh_shortfall().
- FrameTimingRecorder.plan_refresh(): once the measured period has held for
  three trusted windows, a shortfall is logged once as a warning naming the
  cap to use. DisplayManager calls it only for a real panel, not the
  emulator or the fallback canvas. The stats file records
  planned_refresh_hz (additive).
- GET /api/v3/config/refresh-rate, plus a hint under the Display tab's
  Limit Refresh Rate field (js/pages/display.js) with a button that fills in
  the suggested cap.
- _panel_refresh_hz (behind the Vegas slider's advice) ignores a measurement
  written under a different cap, so a changed cap stops being advised from
  the old rate before the display restarts.

Verified on ledpi with a temporary 200 Hz cap: the warning logged about a
minute after the restart ("about 132 Hz ... Set Limit Refresh Rate to
120 Hz"), the endpoint returned the same shortfall, and the Display tab
showed the hint; its button filled in 120. ledpi was restored afterwards.
Rebased onto main after the Display tab became an ES-module page (#771); the
hint moved from inline script into display.js, with a jsdom test.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* fix(scroll): count only agreeing windows toward the refresh shortfall; ignore a null planned rate

Review fixes on #759.

- A window the period estimate rejects (more than MAX_REFRESH_DROP faster
  than the adopted period) no longer counts toward the shortfall check, and
  it restarts the run. After a loaded start fixed a slow period, later
  windows at the real, faster rate were rejected yet still counted, so the
  warning could name the slow rate against a cap the panel was meeting. It
  now needs REFRESH_CHECK_WINDOWS consecutive windows that agree with the
  period.
- _panel_refresh_hz treats a stats file whose planned_refresh_hz key is
  present but null as no measurement. The emulator and the fallback canvas
  write it that way (DisplayManager never plans a refresh for them), and
  their frame rate says nothing about the cap. A file with no such key (an
  older display) keeps the old behaviour.

Three new tests fail on the previous code and pass now.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/SCROLL_PERFORMANCE.md

@@ -77,6 +77,31 @@ The Vegas **Scroll Speed** slider in the web UI shows the same thing live: a
 line under it says what your speed will run as on this panel, and links to the
 nearest smooth speeds.
 
+### A panel that cannot reach its cap
+
+Speeds are solved against `limit_refresh_rate_hz`, the configured cap, but a
+cap is only a ceiling: a long chain, a high `pwm_bits` or a big
+`gpio_slowdown` can leave the panel below it. One Pi 4 driving 2×128×64 on
+`adafruit-hat-pwm` with `pwm_bits 9` and `gpio_slowdown 5` measured
+107.6–113.1 Hz under a 120 Hz cap. Frames still move whole pixels, but
+every scroll runs that much slower than configured (60 px/s ran at 55 px/s),
+and the smooth speeds are the cap's rather than the panel's.
+
+The display measures the real rate from its own frames. About a minute
+into scrolling, a panel more than 3% short of its cap is logged once:
+
+```
+WARNING - src.common.frame_timing - The panel refreshes at about 113 Hz, below
+the 120 Hz that scroll speeds are planned for ... Set Limit Refresh Rate to
+100 Hz (web UI, Display tab), which this panel can hold, and restart.
+```
+
+The Display tab says the same under **Limit Refresh Rate**, with a button
+that fills in the suggested cap (`GET /api/v3/config/refresh-rate`). The
+suggestion is a multiple of 10 at least 5% under the measurement, because
+an uncapped panel drifts and the measurement is the fast end of it. A cap the
+panel holds also stops the drift.
+
 ### How a slow speed stays crisp
 
 `SwapOnVSync(canvas, framerate_fraction)` holds each frame for N panel