fix(pwa): reword the install prompt and keep it off the bottom nav

The banner sat fixed at the viewport bottom at z-index 1000, covering the
authed shell's mobile nav; it now offsets above the nav's geometry when a
signed-in mobile user has one. New casual copy replaces the Twilio line,
the dismiss button gains a localized aria-label, and de/es/ja catalogs
carry the new strings.

src/locales/ja/messages.po

@@ -392,6 +392,10 @@ msgstr "アクティビティ"
 msgid "Activity Details"
 msgstr "アクティビティの詳細"
 
+#: src/components/ios-install-prompt.tsx:61
+msgid "Add FLXN to your home screen — smoother experience, always one tap away"
+msgstr "FLXNをホーム画面に追加。もっと快適に使えて、いつでもワンタップで開けます"
+
 #: src/features/tournaments/components/edit-enrolled-players.tsx:117
 msgid "Add Player"
 msgstr "プレイヤーを追加"
@@ -841,6 +845,10 @@ msgstr "転送操作にはdeviceIdが必要です"
 msgid "Disconnect Spotify"
 msgstr "Spotifyの連携を解除"
 
+#: src/components/ios-install-prompt.tsx:68
+msgid "Dismiss"
+msgstr "閉じる"
+
 #: src/features/bracket/components/match-report.tsx:159
 msgid "Does this look right?"
 msgstr "これで合っていますか?"
@@ -1864,10 +1872,6 @@ msgstr "プレイヤーの選択が必要です"
 msgid "Playing on {0}"
 msgstr "{0}で再生中"
 
-#: src/components/ios-install-prompt.tsx:47
-msgid "Please install FLXN • This will save me Twilio credits as you won't be signed out!"
-msgstr "FLXNをインストールしてください • ログアウトされなくなるので、Twilioのクレジット節約になります!"
-
 #: src/features/tournaments/components/group-stage-view.tsx:314
 msgid "Populate Knockout Bracket"
 msgstr "ノックアウトブラケットを作成"
@@ -2320,11 +2324,11 @@ msgstr "T"
 msgid "Tap an opponent below to compare"
 msgstr "下の対戦相手をタップして比較"
 
-#: src/components/ios-install-prompt.tsx:37
+#: src/components/ios-install-prompt.tsx:44
 msgid "Tap Menu (⋮) → Add to Home screen"
 msgstr "メニュー (⋮) をタップ →「ホーム画面に追加」"
 
-#: src/components/ios-install-prompt.tsx:36
+#: src/components/ios-install-prompt.tsx:43
 msgid "Tap Share → Add to Home Screen"
 msgstr "共有をタップ →「ホーム画面に追加」"