fix(desktop): bound settings selector menus

[Astro-Han]

Summary

Keep Selector listbox layers inside settings rows by capping each popover to its anchor width. The existing narrow Daily Review story now reports named geometry failures and rectangles so future regressions remain actionable.

GitHub's Linux font metrics made the model option's intrinsic popover 144.1875px wide while its anchor was 134px. Because the layer aligns to the anchor's left edge, its right edge reached 454.1875px, past the settings page boundary at 452px. The same label measured narrower locally, which hid the overflow.

Refs #2541

Verification

• GitHub Storybook RED: popoverWithinPage; popover right 454.1875, page right 452.
• Causal local probe with widened option text: disabling the new cap expands the popover from the 134px anchor to 199.359375px; enabling it keeps both at 134px.
• npx biome check apps/desktop/src/renderer/styles/settings/rows.css apps/desktop/stories/settings/settings-pages.stories.tsx
• npm --workspace @maka/desktop run typecheck:stories
• npm --workspace @maka/desktop run build-storybook
• Full local Storybook smoke: both Daily Review floor checks pass; only the known icon catalog failure fixed by fix(storybook): filter non-component icon exports #2544 remains.

Dependency

• fix(storybook): filter non-component icon exports #2544 must merge (or this branch must rebase onto it) before the complete Storybook job can be green.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No