profiler: mask-match IMSI/ICCID contents on 'Profile from card'

When generating a ruleset from the card, capture EF.IMSI (6F07) and
EF.ICCID (2FE2) contents as a mask matching only the first 4 bytes
(e.g. 08290591??????????), the rest are '?' wildcards.

Add profilerMaskPrefix4 helper + PROFILER_MASK_PREFIX4_FIDS map + tests.
SW cache v44.

frontend/tests/profiler.test.js

@@ -21,7 +21,7 @@ function extractFunc(src, name) {
 	return src.slice(m.index, i + 1);
 }
 
-const FNS = ['profilerNormHex', 'profilerMatch', 'profilerMatchMin', 'profilerValidateProfile'];
+const FNS = ['profilerNormHex', 'profilerMatch', 'profilerMatchMin', 'profilerMaskPrefix4', 'profilerValidateProfile'];
 let code = '';
 for (const f of FNS) code += extractFunc(html, f) + '\n';
 eval(code);
@@ -68,6 +68,12 @@ test('profilerMatchMin compares the shorter overlapping portion', () => {
 	assert.ok(!profilerMatchMin('mask', '08?91?AA', '091110'));
 });
 
+test('profilerMaskPrefix4 keeps first 4 bytes and masks the rest', () => {
+	assert.strictEqual(profilerMaskPrefix4('082905911234567890'), '08290591??????????');
+	assert.strictEqual(profilerMaskPrefix4('08290591'), '08290591');
+	assert.strictEqual(profilerMaskPrefix4('1234'), '1234');
+});
+
 test('profile validation', () => {
 	assert.strictEqual(profilerValidateProfile(null), 'Not an object');
 	assert.strictEqual(profilerValidateProfile({ name: 'x' }), 'Missing rules array');