feat: rename app from 'Hermes Control' to 'Hermes Mobile' (#412)

* feat: rename app from 'Hermes Control' to 'Hermes Mobile'

Updates the display name in launcher icon, About screen, and
landing/auth screen. Package name (com.m57.hermescontrol) unchanged.

* chore: update release workflow references to Hermes Mobile

Renames keystore file, APK artifact, and GitHub Release name
from 'hermes-control' / 'Hermes Control' to 'hermes-mobile'
/ 'Hermes Mobile'.

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Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/theme/Color.kt

@@ -2,7 +2,7 @@ package com.m57.hermescontrol.theme
 
 import androidx.compose.ui.graphics.Color
 
-// Hermes Control brand palette — v3 (Material You rewrite).
+// Hermes Mobile brand palette — v3 (Material You rewrite).
 //
 // On Android 12+ (API 31+) the app uses dynamic colour derived from the user's
 // wallpaper — this palette is NOT used for primary/surface roles on those