Welcome page polish + ToS placeholder + made_fun text fix

- res/values/strings_en.arb: made_easy value 'made easy' -> 'made fun'.
  This is what AnimatedTypingText actually feeds (line 183 of
  create_pin_welcome_page.dart), not payment_made_easy which is unused
  in this rendering path.
- assets/images/cake_logo_{light,dark}.svg replaced with mark-only
  (hash_wallet/01_mark.svg — just the # in green box, no embedded
  wordmark). Welcome screen layout already renders 'Hash Wallet' text
  next to this image; the previous wordmark-embedded SVG caused the
  duplicate 'Hash Wallet [...] Hash Wallet' you screenshot'd. Mark
  alone is theme-agnostic (green box with white # works on both light
  and dark backgrounds), so light + dark use the same file.
- assets/images/welcome_{dark,light}_theme.svg: gradient bottom stop
  faded to transparent. Eliminates the hard cutoff edge where the
  sky-rect ended and flat surface color began — the SVG now blends
  smoothly into the page background.
- assets/text/Terms_of_Use.txt: replaced 188-line Cake Labs LLC legal
  document with a Hash Wallet placeholder (same pattern as PRIVACY.md).
  Real ToS pending legal review.

assets/images/cake_logo_dark.svg

@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 360 100" width="360" height="100">
-<title>Hash Wallet horizontal lockup (dark theme)</title>
-<desc>Hash Wallet logo with green-boxed hash mark on the left and a white wordmark to the right, intended for dark-theme backgrounds.</desc>
-<rect x="10" y="18" width="64" height="64" rx="14" fill="#1a5c38"/>
-<text x="42" y="68" font-family="ui-monospace, 'JetBrains Mono', 'Courier New', monospace" font-size="48" font-weight="700" fill="#ffffff" text-anchor="middle">#</text>
-<text x="90" y="63" font-family="ui-monospace, 'JetBrains Mono', 'Courier New', monospace" font-size="32" font-weight="500" fill="#ffffff">Hash Wallet</text>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100">
+<title>Hash Wallet mark</title>
+<desc>The Hash Wallet mark: a white hash glyph centered in a brand-green rounded square.</desc>
+<rect width="100" height="100" rx="22" fill="#1a5c38"/>
+<text x="50" y="76" font-family="ui-monospace, 'JetBrains Mono', 'Courier New', monospace" font-size="74" font-weight="700" fill="#ffffff" text-anchor="middle">#</text>
 </svg>

assets/images/cake_logo_light.svg

@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 360 100" width="360" height="100">
-<title>Hash Wallet horizontal lockup</title>
-<desc>Hash Wallet logo with green-boxed hash mark on the left and Hash Wallet wordmark to the right.</desc>
-<rect x="10" y="18" width="64" height="64" rx="14" fill="#1a5c38"/>
-<text x="42" y="68" font-family="ui-monospace, 'JetBrains Mono', 'Courier New', monospace" font-size="48" font-weight="700" fill="#ffffff" text-anchor="middle">#</text>
-<text x="90" y="63" font-family="ui-monospace, 'JetBrains Mono', 'Courier New', monospace" font-size="32" font-weight="500" fill="#1a1a1a">Hash Wallet</text>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100">
+<title>Hash Wallet mark</title>
+<desc>The Hash Wallet mark: a white hash glyph centered in a brand-green rounded square.</desc>
+<rect width="100" height="100" rx="22" fill="#1a5c38"/>
+<text x="50" y="76" font-family="ui-monospace, 'JetBrains Mono', 'Courier New', monospace" font-size="74" font-weight="700" fill="#ffffff" text-anchor="middle">#</text>
 </svg>

assets/images/welcome_dark_theme.svg

@@ -6,9 +6,9 @@
 <!-- Gradient backdrop: very dark green at top fading to surface bg -->
 <defs>
   <linearGradient id="skyDark" x1="0" y1="0" x2="0" y2="1">
-    <stop offset="0%" stop-color="#06150C" />
+    <stop offset="0%"  stop-color="#06150C" />
     <stop offset="60%" stop-color="#0B1F14" />
-    <stop offset="100%" stop-color="#112A1D" />
+    <stop offset="100%" stop-color="#0B1F14" stop-opacity="0" />
   </linearGradient>
   <radialGradient id="glowPink" cx="0.5" cy="0.5" r="0.5">
     <stop offset="0%" stop-color="#E16FA6" stop-opacity="0.35" />

assets/images/welcome_light_theme.svg

@@ -7,7 +7,7 @@
   <linearGradient id="skyLight" x1="0" y1="0" x2="0" y2="1">
     <stop offset="0%"  stop-color="#C7E5D2" />
     <stop offset="60%" stop-color="#EAF2EC" />
-    <stop offset="100%" stop-color="#F2F8F4" />
+    <stop offset="100%" stop-color="#F2F8F4" stop-opacity="0" />
   </linearGradient>
   <radialGradient id="sunGlow" cx="0.5" cy="0.5" r="0.5">
     <stop offset="0%"  stop-color="#FFD466" stop-opacity="0.95" />

res/values/strings_en.arb

@@ -602,7 +602,7 @@
   "long_press_show_balance": "Long press card to show balance",
   "low_fee": "Low fee",
   "low_fee_alert": "You currently are using a low network fee priority. This could cause long waits, different rates, or canceled trades. We recommend setting a higher fee for a better experience.",
-  "made_easy": "made easy",
+  "made_easy": "made fun",
   "manage_nodes": "Manage nodes",
   "manage_pow_nodes": "Manage PoW nodes",
   "manage_providers": "Manage providers",