feat(store): UI-slot templates move to iPad mini proportions

Re-proportion slot-03.svg/slot-04.svg's drawn device from 0.75 to
0.657 per Jan's call, re-capture 03/04 on an iPad mini sim in dark
mode, and confirm ipad/en is still 6/6 with a clean --check/--list.
The half-empty-screen defect reads as resolved by dark mode alone,
no crop change needed.

Claude-Session: https://claude.ai/code/session_01FSMU2G3JXpeRqF61zHdjwS

Author: kipp-ing

Design/AppStore/templates/ipad/slot-03.svg

@@ -68,6 +68,39 @@ still bad after dark+mini.
 8. **Watch #58** (`AccentColor.colorset` empty): if the Messing accent lands before the UI-slot
    captures are finalized, every one of 03/04/05 needs re-capturing again.
 
+### Step 1 done this session: slots 03/04 rebuilt on iPad mini, dark
+
+`slot-03.svg`/`slot-04.svg` re-proportioned from 0.75 to 0.657 (screen quad `168,820,1728,2304` →
+`275,820,1514,2304`; device `132,784,1800,2376` → `239,784,1586,2376`; bezel, corner radii,
+headline baseline all unchanged, same geometry shared between the two templates as before).
+225/225 renderer unit tests still green — no template-format regression.
+
+Re-captured `test01_onboardingChoice`/`test17_albumPickerMany` on **iPad mini (A17 Pro), iOS
+18.6** (`12D70693-FF3D-42EE-B50D-87F180B0D486`), `xcrun simctl ui <UDID> appearance dark`, the
+documented AP-4 env vars (`SCREENSHOT_PORTRAIT`, `SCREENSHOT_TEXT_SIZE=AccessibilityM`,
+`SCREENSHOT_LOCALE=en`), status bar override. Captures came back **1488 × 2266**, matching the
+measured mini aspect. **Belt-and-suspenders on the false-green trap:** set `SCREENSHOT_DE` both
+via `simctl … launchctl setenv` *and* as a trailing `TEST_RUNNER_SCREENSHOT_DE=1` xcodebuild
+argument, then confirmed from the raw test log that both cases actually executed (not skipped)
+before trusting the attachments — 2 tests run, 2 attachments exported, not 0-run-SUCCEEDED.
+
+Overwrote `ipad/en/03-slot-source-choice.png`, `04-slot-album-picker.png` (and the
+`en-axm-ios18` sibling, which FR-9010-34 keeps byte-identical to `en/`) with the new mini/dark
+captures. Re-rendered and re-checked: **`ipad/en` still 6/6, `--check` and `--list` both clean**,
+03/04 correctly resolve with no `scene` (UI-type slots).
+
+**Verified visually (contact sheet + a full-res crop of slot 03's device edge):**
+- The half-empty-screen defect reads as resolved — app content and the black canvas ground are
+  now visually contiguous, so the old dead margin no longer reads as emptiness. No crop/zoom
+  change was needed; the zoom-vs-whitespace question is moot.
+- The `#1C1C1E` device body still reads as a distinct grey column against `#000000` — legible as
+  a physical object without touching the hairline. No strengthening applied, matching Jan's pick.
+- Slot 2's colour-monotony problem is unchanged (still no cool hero) and slot 5 is still the old
+  room composite — neither was in scope for this step.
+
+**Not yet done:** slot 5 (steps 2–3, the arrival-toast spec + implementation) is still open, as is
+everything after it in the ordered list above.
+
 ---
 
 ## 2026-09-10 (later) — four questions from Jan, answered empirically