docs(reset): "hold until the screen starts to flash" terminology

Renames the user-facing description of the BOOT-button factory reset
across the codebase. The threshold remains 5 s (RESET_HOLD_MS) but
"hold for 5 seconds" misled users: total wall-clock time-to-visible-
change includes ~20 s of e-ink redraw after the threshold fires, and
a too-short press now wakes the device into a normal poll cycle (a
side effect of the EXT0 wakeup we just added). "Until the screen
starts to flash" matches what the user actually sees.

  - Remove-this-frame modal gains a small aside describing the
    physical reset for the new owner, with the new terminology and
    a callout that a brief tap just refreshes the image.
  - CLAUDE.md and the operation.h comment near the EXT0 wake call
    use the same phrasing.
  - feedback_reset_terminology.md memory locks the rule for future
    edits — never write "hold for 5 seconds" in user copy.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/build/index.html

@@ -14,7 +14,7 @@
     <meta name="mobile-web-app-capable" content="yes" />
     <meta name="apple-mobile-web-app-status-bar-style" content="default" />
     <meta name="apple-mobile-web-app-title" content="pictureFrame" />
-    <script type="module" crossorigin src="/build/assets/index-BojlVxcP.js"></script>
+    <script type="module" crossorigin src="/build/assets/index-CmcHGdN5.js"></script>
     <link rel="modulepreload" crossorigin href="/build/assets/_plugin-vue_export-helper-DRLwVS0w.js">
     <link rel="stylesheet" crossorigin href="/build/assets/index-BlLBHR1q.css">
   </head>