refactor(structures): optimize message loading with msgFindBefore

[JuniorRibas]

Description

Replaces WAWebChatLoadMessages.loadEarlierMsgs with WAWebDBMessageFindLocal.msgFindBefore when paginating messages until reaching searchOptions.limit in both Chat and Channel, resolving models through MsgStore when the returned entries are not yet serialized.

Related Issue(s)

N/A

Testing Summary

Test Details

• npx eslint on the modified files: OK.
• Full npm test requires WWEBJS_TEST_REMOTE_ID (integration). Manual validation is recommended for message fetching with limit in chats/channels.

Environment

• Machine OS: (fill in)
• Phone OS: (fill in)
• Library Version: 1.34.6
• WhatsApp Web Version: (fill in — await client.getWWebVersion())
• Browser Type and Version: (fill in)
• Node Version: (fill in)

Type of Change

• Dependency change
• Bug fix
• New feature
• Breaking change
• Non-code change
• Refactor / performance (internal message loading)

Checklist

• My code follows the style guidelines of this project.
• All new and existing tests pass (npm test). (integration suite requires environment variables)
• Typings have been updated if necessary. (no public API changes)
• Usage examples / documentation have been updated if applicable.

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Closes #201706

Closes #201706

[themazim]

works for me as expected for chats and channels.

[JoaoAndrad]

The PR fix worked as expected. Everything is working correctly now

[AnthonyDevelop]

The PR fix worked as expected. Everything is working correctly now

[olirock]

Some conversations (even recent ones, from the same day, the previous day, etc.) only return one message, when in fact there are more messages. I haven't been able to identify why yet, but this problem didn't occur before.

[themazim]

Some conversations (even recent ones, from the same day, the previous day, etc.) only return one message, when in fact there are more messages. I haven't been able to identify why yet, but this problem didn't occur before.

under circumstances this is actually true.

The fix is to add msgs to merged like this in the PR:

Chat and Channels change to:

                            let merged = [
                                ...loaded,
                                ...(anchorMsg ? [anchorMsg] : []),
                                ...msgs,
                            ];

afterwards it works

[tuyuribr]

Miss approval

[BenyFilho]

That is a better solution for the problem
#201713