fix: broaden friend edge detection to all resolved non-class locations

The friend SQL query was hardcoded to location='public', missing meetings
at cafes, libraries, paths, and other resolved locations. This caused
under-counting of friend edges compared to stranger/familiar-stranger
queries which already used location NOT IN ('class','unknown','').

Align the friend query with the same inclusive filter used by the other
relationship types.

Fixes #134

Author: sauravbhattacharya001

Gvisual/src/app/Network.java

@@ -99,7 +99,7 @@ public static void generateFile(String path, String Month, String Date, int dThr
                 + " FROM ( SELECT imei1 , imei2, count(*) as C,avg(duration) as d"
                 + "       FROM ( SELECT imei1, imei2, duration"
                 + "              FROM meeting"
-                + "              WHERE month = ? AND date = ? AND location= 'public' AND duration > ?) as b"
+                + "              WHERE month = ? AND date = ? AND location NOT IN ('class', 'unknown', '') AND duration > ?) as b"
                 + "       GROUP BY imei1, imei2) as a, deviceID as x, deviceID as y"
                 + " WHERE C >= ? AND a.imei1= x.imei AND a.imei2 = y.imei";