fix(memory): timeline UI alignment issues and highlighting issue (#8753) to release v3.0

[github-actions]

Cherry-pick of commit 3bc1b89 to release/v3.0 branch.

Original PR: #8753

• [Optional] Override Linear Check

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Summary by cubic

Fixes timeline alignment for reasoning/deep-research/memory tool steps and makes memory highlighting focus reliable in the Memories modal. Improves readability and interaction in v3.0.

• Bug Fixes
  • Timeline: detect reasoning, deep research plan, and memory tool packets; render the active step full-width (no right padding) and pass noPaddingRight to the renderer.
  • Memories modal: after auto-scroll to a highlighted item, focus the textarea to ensure the highlight applies and allow immediate editing.

^{Written for commit d58ea04. Summary will update on new commits.}

[greptile-apps]

Greptile Summary

Cherry-pick of UI bug fixes from PR #8753 to the release/v3.0 branch.

Changes:

• Fixed timeline alignment issues by removing right padding for reasoning, deep research, and memory tool content types
• Improved memory modal UX by automatically focusing the textarea when highlighting a memory item

Code Quality:

• All changes follow web/STANDARDS.md frontend standards
• Proper use of React hooks with correct dependency arrays
• TypeScript types are properly maintained
• Uses existing helper functions from packetHelpers.ts

Confidence Score: 5/5

• This PR is safe to merge with no risks
• Clean cherry-pick of well-tested UI fixes with no logical errors, proper React patterns, and adherence to all frontend standards
• No files require special attention

Important Files Changed

Filename	Overview
web/src/app/app/message/messageComponents/timeline/ParallelTimelineTabs.tsx	Added conditional padding logic for specific packet types to fix timeline alignment issues
web/src/refresh-components/modals/MemoriesModal.tsx	Added textarea focus on highlight to improve UX when scrolling to memory items

_{Last reviewed commit: d58ea04}

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.