frontend: views: ExtensionManagerView: center extension manager tabs

[nicoschmdt]

fix #2942

before:

zoomed-in:

after:

zoomed-in:

Summary by Sourcery

Center the extension manager tab bar while keeping the settings button consistently positioned.

Enhancements:

• Adjust ExtensionManagerView toolbar layout so tabs fill available space and remain centered across viewport sizes.
• Pin the extension manager settings button to the right side of the toolbar on larger screens for a stable, predictable location.

[sourcery-ai]

Reviewer's Guide

Centers the Extension Manager tabs within the toolbar and keeps the Settings button aligned to the right via flexbox and responsive CSS adjustments.

Flow diagram for ExtensionManagerView toolbar layout changes

flowchart LR
  ExtensionToolbar[ExtensionToolbar v_toolbar extension_toolbar] --> ExtensionTabs[ExtensionTabs v_tabs extension_tabs]
  ExtensionToolbar --> SettingsButton[SettingsButton v_btn extension_toolbar_settings]

  subgraph FlexLayout
    ExtensionTabsFlex[extension_tabs flex 1_1_0 min_width 0]
    SettingsButtonFlex[extension_toolbar_settings flex_shrink 0]
  end

  ExtensionTabs --> ExtensionTabsFlex
  SettingsButton --> SettingsButtonFlex

  subgraph DesktopMediaQuery min_width_900px
    SettingsButtonPosition[extension_toolbar_settings position absolute right 16px top 50_percent translateY_minus_50_percent]
  end

  SettingsButtonFlex --> DesktopMediaQuery
  DesktopMediaQuery --> SettingsButtonPosition

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File-Level Changes

Change	Details	Files
Refactor the extension manager toolbar layout to center tabs and decouple the Settings button from tab sizing.	Replace spacer-based centering with a custom toolbar class to control positioning context. Configure v-tabs with flex growth and overflow-safe min-width via a new CSS class. Prevent the Settings button from shrinking with the tabs and move alignment control to a dedicated class. Use a media query on wider viewports to absolutely position the Settings button to the right and vertically center it within the toolbar.	core/frontend/src/views/ExtensionManagerView.vue

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2942	Center the extension manager tabs within the card/toolbar so they are visually centered and no longer pushed left by the settings cog.	✅
#2942	When horizontal space runs out, have the tabs become scrollable and be cut off on the right under the settings cog (rather than shifting layout), so they can scroll out from underneath it.	✅

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[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• The custom centering and right-align behavior for the toolbar could likely be expressed using Vuetify’s layout utilities (e.g., justify-center, v-spacer, class="ml-auto") instead of absolute positioning, which would simplify the CSS and reduce layout edge cases.
• Consider replacing the hardcoded @media (min-width: 900px) and right: 16px breakpoint/spacing values with existing design system or Vuetify breakpoint/spacing tokens so the layout stays consistent with the rest of the app’s responsive behavior.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The custom centering and right-align behavior for the toolbar could likely be expressed using Vuetify’s layout utilities (e.g., `justify-center`, `v-spacer`, `class="ml-auto"`) instead of absolute positioning, which would simplify the CSS and reduce layout edge cases.
- Consider replacing the hardcoded `@media (min-width: 900px)` and `right: 16px` breakpoint/spacing values with existing design system or Vuetify breakpoint/spacing tokens so the layout stays consistent with the rest of the app’s responsive behavior.

## Individual Comments

### Comment 1
<location path="core/frontend/src/views/ExtensionManagerView.vue" line_range="218-226" />
<code_context>
     />
-    <v-toolbar>
-      <v-spacer />
+    <v-toolbar class="extension-toolbar">
       <v-tabs
         v-model="tab"
</code_context>
<issue_to_address>
**issue (bug_risk):** Absolute positioning of the settings button may overlap the tabs without reserving horizontal space.

With `.extension-toolbar-settings` absolutely positioned, the tabs can extend underneath it because the toolbar no longer reserves horizontal space for the button. Around the breakpoint this can cause the settings icon to overlap tab labels or arrows.

Consider adding right padding or a max-width on `.extension-toolbar` (or similar layout change) so the tabs never render under the settings icon.
</issue_to_address>

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[ES-Alexander]

Seems to be better but still not quite fixed?