Before this commit, when using livechat by visitor in mobile, any page reload would remove access to the livechat.

Steps to reproduce:
- access to website with livechat installed on mobile
- click on livechat button (bubble icon in bottom right)
- send a message
- reload the page

=> the livechat is not open, not even as a chat bubble.

This prevents visitor from access the livechat again, except if user finds a workaround to open the same page in non-mobile mode (e.g. landscape mode or disabling high-dpi).

This happens because livechat relies on discuss chat hub, and there's some code to prevent server-side synchronisation of chat windows and bubbles in mobile. As a reminder, conversation in mobile are shown as fullscreen chat windows.
This code was preventing the opening of chat window on livechat for visitor, leading to prevention of continuing to live chat on the device.

This commit fixes by adding fold action to chat windows in mobile specifically for livechat visitors, thus allowing to have chat bubbles in mobile. This fixes allow to show chat windows as bubbles to livechat visitors, which is the primary fix of these changes.

Due to chat windows being server-synced, we made sure to not sync chat windows in the backend. To do so, we rely on presence of livechat service to determine when the chat bubble feature should work in mobile.

opw-4423556
opw-4488830

closes odoo/odoo#194363

**Problem:**
When having multiple quants for a product with the same lot but different packages in the same location. Not all quants are visible in the barcode app inventory.

**Steps to reproduce:**
- In settings activate the following settings : Packages, Storage Locations, Count Entire Locations
- Open Inventory/Products
- Create a new product
- Check the "track inventory" field and select "By Lot"
- Go to Inventory/Operations/Physical Inventory and create a new line for your product
- As Location put WH/Stock/Shelf 1
- Write Lot1 for the Lot and Pack1 for the Package
- Set a quantity of 5
- Save and Apply
- Do the same for another line put but Pack2 for the Package
- Open the barcode app and select inventory adjustments
- Click on the barcode icon on the top right of the screen
- Write SHELF1 and click on apply

**Current behavior:**
Only 5 unit of your product are displayed (those for Pack1)

**Expected behavior:**
10 units should be displayed. The 5 from Pack1 and the 5 from Pack2

**Cause of the issue:**
When checking if the line already exists, the package is not taken into account
https://github.com/odoo/enterprise/blob/7a132639d6c05ef96d43a48ea34ff11711539fc7/stock_barcode/static/src/models/barcode_quant_model.js#L563-L564 so if a line already exists for the same
lot "!currentLine" will be false and the code inside the if statement will not be run
https://github.com/odoo/enterprise/blob/7a132639d6c05ef96d43a48ea34ff11711539fc7/stock_barcode/static/src/models/barcode_quant_model.js#L565 resulting in the new line not being added in the barcode app

opw-4640303