Phase 2 of [INF-75](https://linear.app/chatwoot/issue/INF-75). Follows
up on [#14753](https://github.com/chatwoot/chatwoot/pull/14753) (Phase 1
UA pattern fallback, already merged).
When the request carries an \`X-Chatwoot-Client-Name\` header,
\`UserSessionTrackingService\` now prefers the five structured
\`X-Chatwoot-*\` headers over the User-Agent for populating the
\`user_sessions\` row:
| Header | Mapped column |
|---|---|
| \`X-Chatwoot-Client-Name\` | \`browser_name\` |
| \`X-Chatwoot-Client-Version\` | \`browser_version\` |
| \`X-Chatwoot-Device-Model\` | \`platform_name\` |
| \`X-Chatwoot-Platform-Version\` | \`platform_version\` |
| \`X-Chatwoot-Platform\` (+ model) | \`device_name\` (\`iPhone\` /
\`iPad\` / \`Android\`) |
When the header is absent or blank, the existing \`Browser.new\` path
runs, with the Phase 1 legacy UA fallback still acting as the floor.
Real browsers are untouched.
A follow-up PR in
[chatwoot-mobile-app](https://github.com/chatwoot/chatwoot-mobile-app)
will start sending these headers from the React Native build. Until that
ships, this PR is a no-op for production traffic, so it can land
independently.
Fixes INF-75.
## Description
Sessions created by logins from the Chatwoot Mobile app currently render
as "Unknown Device" in the dashboard sessions UI. The mobile app's HTTP
layer sends:
- Android: `User-Agent: okhttp/4.9.2`
- iOS: `User-Agent: Chatwoot/<build> CFNetwork/<v> Darwin/<v>`
Neither pattern is classifiable by the `browser` gem, so
\`browser_name\`, \`platform_name\`, and \`device_name\` all end up
"Unknown".
This change adds a backend-only fallback in
\`UserSessionTrackingService\`. When \`Browser.new(ua)\` returns
"Unknown Browser" and the UA matches a known Chatwoot Mobile pattern,
the labels are overridden to \`Chatwoot Mobile\` + \`Android\` /
\`iPhone\`. The Vue sessions list (\`ActiveSessions.vue\`) then renders
"Chatwoot Mobile on Android" or "Chatwoot Mobile on iPhone" with the
smartphone icon.
This is the immediate floor. A follow-up will add structured
\`X-Chatwoot-*\` headers from the mobile app so we can render full
version + device model.
Fixes INF-75.
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
## How Has This Been Tested?
- Added specs
## Checklist:
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules
## Description
First PR of user_sessions feature - enforcement, impersonation and mfa will be handled separately.
Adds an Active Sessions section under Profile where users can see every
device currently logged in and revoke any session they don't recognize.
Helps users lock down stale or unrecognized logins on their own without
needing support.
**Behavior at the limit, by client:**
- **Browser:** returns 409 with a picker overlay; user picks a session
to revoke or chooses "End all sessions" to clear them.
- **Mobile / API client:** silently evicts the oldest session and
proceeds with login (no picker UI to render).
- **Pre-tracking users** (token rows without `user_sessions`, i.e.
anyone already logged in before this ships): silent-evict any untracked
token first, so freshly tracked sessions are never killed in favor of
legacy ones.
Sessions are stored in a new `user_sessions` table keyed on `(user_id,
client_id)` with browser, platform, IP, last activity and (when
configured) geo. Kept in sync with `user.tokens` via an after_save
callback so revoking a token from any path cleans up the row.
Fixes https://linear.app/chatwoot/issue/CW-7169
## Type of change
- [x] New feature (non-breaking change which adds functionality)
## How Has This Been Tested?
- Added specs.
- Manual local testing: browser picker fires at limit; pre-tracking user
silent-evicts; mixed tracked/untracked correctly drops the untracked one
first; profile page revoke succeeds; current session cannot be revoked
from profile.
## Checklist
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules
