This update introduces a timeline-style view for messages, helping users follow conversations and activity history more clearly. It also updates related mail, HR, and gamification screens so messaging feels more consistent and easier to scan across the system.

- Task: https://www.odoo.com/web/#id=9367&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.R0YWt0jSBGBNI0aU

Adds a clear warning when a user's selected timezone differs from their browser timezone. This helps users spot configuration mismatches that could cause appointments, deadlines, or activity times to appear incorrectly.

This update adds default accounting accounts needed for Canada payroll and corrects tax sign handling. It helps Canadian payroll setup work more reliably with the standard chart of accounts, reducing manual configuration for businesses.

This PR is related to https://github.com/odoo/odoo/pull/6465 for v8 and
https://github.com/odoo/odoo/pull/5351 for v7.

The Canada payroll is almost complete and will soon be merged to OCA, see https://github.com/OCA/l10n-canada/pull/43 and https://github.com/OCA/l10n-canada/pull/56. This pull request adds the default accounts for the Canada payroll.

The report styling file was replaced with a readable, uncompressed version while keeping the same visual reset behavior. A source reference was added so teams can verify where the stylesheet came from, improving maintainability with minimal business impact.

Added "reset.url" to document origin of the "reset.css".