fix(frontend): prevent memory settings layout overflow

[LittleChenLiya]

Summary

• Allow the settings dialog content column to shrink with minmax(0, 1fr).
• Add min-w-0 to the scroll/content containers and Memory toolbar groups so long button groups wrap inside the panel instead of expanding past the dialog.
• Force Memory summary and fact text to wrap within the panel, including long English text or unbroken content.

Root Cause

The settings dialog used a 220px 1fr grid. Because grid items default to min-width: auto, the Memory page toolbar and markdown content could force the right content column wider than the dialog. The toolbar contains non-shrinking buttons, and long summary/fact text did not have an aggressive wrap rule, so controls or content could overflow outside the settings panel in constrained widths.

Fixes #2418.

Verification

• pnpm.cmd format
• pnpm.cmd lint
• pnpm.cmd typecheck
• BETTER_AUTH_SECRET=local-dev-secret pnpm.cmd build

The production build completed successfully. It emitted local Better Auth secret/base URL warnings and Nextra git timestamp warnings, but no build errors.

[Copilot]

Pull request overview

Fixes Settings dialog layout overflow on the Memory settings page by allowing the right-hand content column and its children to shrink and wrap correctly in constrained widths.

Changes:

• Updated the Settings dialog grid to use minmax(0, 1fr) so the content column can shrink without forcing overflow.
• Added min-w-0 to scroll/content containers and Memory toolbar wrappers to prevent flex/grid min-content sizing from expanding the dialog.
• Forced long Memory summary/fact text (including unbroken strings) to wrap within the panel using overflow-wrap:anywhere.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
frontend/src/components/workspace/settings/settings-dialog.tsx	Makes the right grid column shrinkable and prevents the ScrollArea/content container from forcing dialog overflow.
frontend/src/components/workspace/settings/memory-settings-page.tsx	Adds shrink/wrap constraints to toolbar and Memory markdown/text blocks so long content doesn’t expand past the panel.