feat(android): blue instead of cyan, everywhere at once

Cyan came from the desktop app. On the phone the reference is the system: its global search and its own apps are blue, and an app should look like the place it runs.

Accent #3B82F6 on the same slate, with white on the accent since blue is darker than cyan. The launcher icon and the launch screen follow - a cyan padlock in front of a blue interface would have read as a different app.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

android-client/PMA.Theme.pas

@@ -23,15 +23,19 @@ uses
   System.UITypes, System.Classes, FMX.Types, FMX.Objects, FMX.StdCtrls;
 
 const
-  // Ardoise et cyan, la palette du poste Windows.
+  // Ardoise et bleu. Le poste Windows accentue en cyan ; ici c'est le bleu
+  // d'Android - celui de la recherche globale et des applications systeme.
+  // Une application mobile a deux references legitimes, celle dont elle
+  // prolonge le service et celle du systeme qui l'heberge ; pour ce qui se
+  // touche, la seconde l'emporte.
   COL_BG      = TAlphaColor($FF0F172A);   // fond general
   COL_SURFACE = TAlphaColor($FF1E293B);   // blocs poses dessus
   COL_RAISED  = TAlphaColor($FF334155);   // bouton au repos
   COL_LINE    = TAlphaColor($FF334155);   // filet des cadres
   COL_TEXT    = TAlphaColor($FFE2E8F0);
   COL_MUTED   = TAlphaColor($FF94A3B8);
-  COL_ACCENT  = TAlphaColor($FF22D3EE);
-  COL_ON_ACC  = TAlphaColor($FF042F3B);   // texte sur fond accentue
+  COL_ACCENT  = TAlphaColor($FF3B82F6);
+  COL_ON_ACC  = TAlphaColor($FFFFFFFF);   // texte sur fond accentue
 
 /// A appeler une fois, avant la creation de la forme.
 procedure ApplyDarkTheme;

android-client/android-res/drawable/ic_launcher_foreground.xml

@@ -10,14 +10,14 @@
     android:viewportHeight="108">
     <!-- Anse : trait, pas remplissage, pour garder l'interieur ajoure. -->
     <path
-        android:strokeColor="#22D3EE"
+        android:strokeColor="#3B82F6"
         android:strokeWidth="5.5"
         android:strokeLineCap="round"
         android:fillColor="#00000000"
         android:pathData="M44,56 L44,47 A10,10 0 0 1 64,47 L64,56" />
     <!-- Corps -->
     <path
-        android:fillColor="#22D3EE"
+        android:fillColor="#3B82F6"
         android:pathData="M38,54 L70,54 A4,4 0 0 1 74,58 L74,76 A4,4 0 0 1 70,80 L38,80 A4,4 0 0 1 34,76 L34,58 A4,4 0 0 1 38,54 Z" />
     <!-- Serrure, evidee dans la couleur du fond -->
     <path

android-client/android-res/drawable/splash_vector.xml

@@ -10,13 +10,13 @@
     android:viewportWidth="288"
     android:viewportHeight="288">
     <path
-        android:strokeColor="#22D3EE"
+        android:strokeColor="#3B82F6"
         android:strokeWidth="11"
         android:strokeLineCap="round"
         android:fillColor="#00000000"
         android:pathData="M124,139 L124,121 A20,20 0 0 1 164,121 L164,139" />
     <path
-        android:fillColor="#22D3EE"
+        android:fillColor="#3B82F6"
         android:pathData="M112,135 L176,135 A8,8 0 0 1 184,143 L184,179 A8,8 0 0 1 176,187 L112,187 A8,8 0 0 1 104,179 L104,143 A8,8 0 0 1 112,135 Z" />
     <path
         android:fillColor="#0F172A"

android-client/make-icons.ps1

@@ -9,7 +9,7 @@ Add-Type -AssemblyName System.Drawing
 
 $root = Join-Path $PSScriptRoot 'android-res'
 $bg   = [System.Drawing.Color]::FromArgb(255, 15, 23, 42)     # #0F172A
-$fg   = [System.Drawing.Color]::FromArgb(255, 34, 211, 238)   # #22D3EE
+$fg   = [System.Drawing.Color]::FromArgb(255, 59, 130, 246)   # #3B82F6
 
 # densite -> cote en pixels, tel qu'Android les attend
 $sizes = @{ 'drawable-ldpi' = 36; 'drawable-mdpi' = 48; 'drawable-hdpi' = 72