[PM-37779] - Add notification bar confirmation mode for inline menu save flow

[jaasen-livefront]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-37779

📔 Objective

Adds the infrastructure needed to open the notification bar directly in
the "Login saved" confirmation state, bypassing the normal "Save login?"
prompt. This is a prerequisite for the "Save and fill" inline menu flow
(PR 2), but is independently useful — it decouples the confirmation
notification from the save-prompt lifecycle.

Changes:

• NotificationBarIframeInitData: add isConfirmation and
  confirmationData fields
• bar.ts: when isConfirmation is set, short-circuit to the
  post-save confirmation state rather than rendering the "Save login?"
  prompt
• overlay-notifications-content.service.ts (abstractions +
  implementation): thread isConfirmation / confirmationData through
  from the openNotificationBar message to the bar iframe init data
• notification.background.ts: add triggerLoginSavedNotification —
  sends openNotificationBar with isConfirmation: true to a given
  tab; add showLoginSavedNotification message handler — looks up the
  tab by senderTabId and calls triggerLoginSavedNotification

📸 Screenshots

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 7.14286% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.45%. Comparing base (0345984) to head (40e3149).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...src/autofill/background/notification.background.ts	0.00%	11 Missing ⚠️
apps/browser/src/autofill/notification/bar.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20752      +/-   ##
==========================================
- Coverage   47.46%   47.45%   -0.01%     
==========================================
  Files        4003     4003              
  Lines      123145   123158      +13     
  Branches    18945    18950       +5     
==========================================
+ Hits        58447    58448       +1     
- Misses      60272    60284      +12     
  Partials     4426     4426              

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[bw-ghapp]

⚠️ Changes in this PR impact the Autofill experience of the browser client ⚠️

BIT has tested the core experience with these changes and all feature flags disabled.

Caution

Unfortunately, one or more of these tests failed. 😞

Please resolve the failure before merging; reach out to @bitwarden/team-autofill-dev if you'd like help.

You can view the detailed results of the tests here.

[bw-ghapp]

⚠️ Changes in this PR impact the Autofill experience of the browser client ⚠️

BIT has tested the core experience with these changes and the feature flag configuration used by vault.bitwarden.com

Caution

Unfortunately, one or more of these tests failed. 😞

Please resolve the failure before merging; reach out to @bitwarden/team-autofill-dev if you'd like help.

You can view the detailed results of the tests here.