feat: Add /force-encryption command and update message handling

Implement /force-encryption command to configure forced encryption
settings with on|off and policy resend-to-confirm|block options.

The changes enhance user experience by clarifying encryption requirements
and providing actionable commands. Users can now press Enter again to
confirm unencrypted messages in resend-to-confirm mode.

src/ui/console.c

@@ -2891,3 +2891,11 @@ cons_privacy_setting(void)
         }
     }
 }
+
+void
+cons_encryption_setting(void)
+{
+    cons_show("Force encryption                                           : %sabled", prefs_get_boolean(PREF_FORCE_ENCRYPTION) ? "en" : "dis");
+
+    cons_show("Force encryption mode                                      : %s", prefs_get_string(PREF_FORCE_ENCRYPTION_MODE));
+}

src/ui/inputwin.c

@@ -294,6 +294,14 @@ inp_get_line(void)
     return line;
 }
 
+void
+inp_set_line(const char* const new_line)
+{
+    rl_replace_line(new_line, 1);
+    rl_point = rl_end;
+    _inp_redisplay();
+}
+
 char*
 inp_get_password(void)
 {

src/ui/inputwin.h

@@ -46,5 +46,6 @@ void inp_win_resize(void);
 void inp_put_back(void);
 char* inp_get_password(void);
 char* inp_get_line(void);
+void inp_set_line(const char* const new_line);
 
 #endif

src/ui/ui.h

@@ -351,6 +351,7 @@ void cons_theme_properties(void);
 void cons_theme_colours(void);
 void cons_show_tlscert(const TLSCertificate* cert);
 void cons_show_tlscert_summary(const TLSCertificate* cert);
+void cons_encryption_setting(void);
 
 void cons_alert(ProfWin* alert_origin_window);
 void cons_remove_alert(ProfWin* window);

src/ui/win_types.h

@@ -188,6 +188,7 @@ typedef struct prof_chat_win_t
     char* last_message;
     char* last_msg_id;
     gboolean has_attention;
+    guint last_attempted_msg_hash;
 } ProfChatWin;
 
 typedef struct prof_muc_win_t

src/ui/window.c

@@ -164,6 +164,7 @@ win_create_chat(const char* const barejid)
     new_win->last_message = NULL;
     new_win->last_msg_id = NULL;
     new_win->has_attention = FALSE;
+    new_win->last_attempted_msg_hash = 0;
     new_win->memcheck = PROFCHATWIN_MEMCHECK;
 
     return &new_win->window;