fix: WhatsApp group conversations showing raw JID as name

[Copilot]

WhatsApp group chats without a subject set show a raw internal JID (e.g. 16154856400-1585405251) as the conversation name in the web UI instead of something readable.

Changes

• isRawGroupJIDName — replaces the previous regex approach; detects raw JID names by comparing the stored name directly against the known JID string or its local part (before @), avoiding false positives on real group subjects that happen to contain digits and hyphens (e.g. "2023-2024 Reunion")
• deriveGroupName — builds a human-readable name from group participant records, preferring saved display names over bare phone numbers; output is deduplicated, sorted alphabetically for a stable result across SQLite row orderings, and capped at 5 names with a "+N more" suffix for large groups
• joinGroupNames — helper that applies the N + "+N more" capping logic
• isPhoneNumber — tightened to require 7–15 digits (ITU-T E.164 range), preventing short numeric strings from being misclassified as phone numbers
• loadChats second pass — for groups whose name is empty or is a raw JID, derive from participants; fall back to the JID only when no participants exist

// Before: raw JID surfaced directly
if c.name == "" {
    c.name = c.jid  // e.g. "16154856400-1585405251@g.us"
}

// After: participant names tried first, safely
if c.name == "" || isRawGroupJIDName(c.name, c.jid) {
    if derived := deriveGroupName(c.participants); derived != "" {
        c.name = derived  // e.g. "Alice, Bob"
    } else {
        c.name = c.jid   // last resort
    }
}

[Copilot]

Pull request overview

This PR improves WhatsApp Native imports so group conversations that have no subject (and therefore surface a raw group JID like 16154856400-1585405251) get a more human-readable name in the web UI by deriving a name from group members.

Changes:

• Add a regex (rawGroupJIDRe) to detect “raw” WhatsApp group JID-style names.
• Add deriveGroupName + isPhoneNumber to build readable group names from participant records.
• Update loadChats to replace empty/raw group names with the derived participant-based name, with tests covering the new behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
internal/importer/whatsapp_native.go	Adds raw-JID detection and participant-derived naming logic for WhatsApp group chats.
internal/importer/whatsapp_native_test.go	Adds unit/integration-style tests for raw-JID detection, name derivation, and loadChats fallback behavior.

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[chz160]

@copilot apply changes based on the comments in this thread

[Copilot]

@copilot apply changes based on the comments in this thread

Done in c8b7785. Three changes applied:

1. rawGroupJIDRe false positives — replaced the regex with isRawGroupJIDName(name, jid) that only triggers when the stored name literally equals the JID or its local part. A real group subject like "2023-2024 Reunion" now passes through untouched (covered by TestLoadChatsRealSubjectNotOverwritten).

2. deriveGroupName nondeterminism — names are now deduplicated, sorted alphabetically (stable across SQLite row orderings), and capped at 5 with a "+N more" suffix for large groups.

3. isPhoneNumber too loose — now requires 7–15 digits (ITU-T E.164 range), so short numeric strings like "1" or "123" are no longer misclassified as phone numbers.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

[chz160]

@copilot apply changes based on the comments in this thread