Bugzilla

Bug 2012212 made the sidebar responsive enough at a basic level, more responsiveness work needs to happen.  Smartbar responsiveness is happening across at least bug 2014931 and the bugs it depends on.

We need to audit the responsiveness in the rest of the sidebar and figure out what needs doing.  

1. The smartbar takes up the full width of the sidebar.
2. [...add more here...]

Bug 2012212 made the sidebar responsive enough at a basic level, more responsiveness work needs to happen.  Smartbar responsiveness is happening across at least bug 2014931 and the bugs it depends on.

We need to audit the responsiveness in the rest of the sidebar and figure out what needs doing.  

1. The smartbar takes up the full width of the sidebar.
2. [...remaining acceptance criteria will be added here today...]

We need make the Smartbar more responsive so that it's more usable at different widths and different contexts.

There are mocks with a few accompanying notes below [this rectangle in Figma](https://www.figma.com/design/5KuePTGmOEUFyCHBHCsGim/AI-Mode-%E2%80%94%C2%A0MVP-Scope-Design?node-id=18821-43281&m=dev).

Acceptance criteria: 
* At default width, the smartbar should be a single line like the URL bar most of the time -- see mocks 1 and 2 (currently it is triggering uidensity="compact" rules at that width).
* Tab title and URL in that single line should be split so that at least the domain is visible -- see the note below mock 1

We need make the Smartbar more responsive so that it's more usable at different widths and different contexts.

There are mocks with a few accompanying notes below [this rectangle in Figma](https://www.figma.com/design/5KuePTGmOEUFyCHBHCsGim/AI-Mode-%E2%80%94%C2%A0MVP-Scope-Design?node-id=18821-43281&m=dev).

Acceptance criteria: 

New tab:
* At sufficiently large width, each dropdown entry  should be a single line like the URL bar most of the time -- see mocks 1 and 2 (this probably at least in part because it is currently triggering uidensity="compact" related rules at that width).
* Tab title and URL in that single line should be split so that at least the domain is visible -- see the note below mock 1
* At sufficiently narrow width, the each dropdown entry _should_ be split across two lines.

Sidebar:
*

We need make the Smartbar more responsive so that it's more usable at different widths and different contexts.

There are mocks with a few accompanying notes below [this rectangle in Figma](https://www.figma.com/design/5KuePTGmOEUFyCHBHCsGim/AI-Mode-%E2%80%94%C2%A0MVP-Scope-Design?node-id=18821-43281&m=dev).

Acceptance criteria: 

These criteria should be validated for both new tab and the sidebar:

1. When the dropdown width > 280px, each dropdown entry  should be a single line -- see mocks 1, 2, and 4 (this is probably at least in part because the smartbar is currently triggering uidensity="compact" related rules at a shorter width than the URL bar).
2. Tab title and URL in that single line should be split so that at least the domain is visible -- see the note below mock 1
3. When the dropdown width <= 280px the each dropdown entry _should_ be split across two lines -- see mocks 3, 5, and 6.