fix(chat): remove scroll-time content-visibility

[yyhhyyyyyy]

Scroll-time content-visibility collapsed off-screen rows to the 180px placeholder while overflow-anchor is disabled, breaking
scroll geometry (viewport jumps to top) and triggering full-list relayout storms that could crash the renderer. Windowed rendering already covers long-list performance, so drop the rule.

Closes #1919

Summary by CodeRabbit

• Bug Fixes
  • Improved message list rendering behavior during active scrolling.
  • Removed scrolling-related optimizations that could affect message visibility or layout.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b6984e97-6f53-4736-ac21-22c787e266da

📥 Commits

Reviewing files that changed from the base of the PR and between 49546ea and 52c60f0.

📒 Files selected for processing (1)

• src/renderer/src/pages/ChatPage.vue

💤 Files with no reviewable changes (1)

• src/renderer/src/pages/ChatPage.vue

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📝 Walkthrough

Walkthrough

ChatPage removes the active-scrolling CSS rules that applied content-visibility and contain-intrinsic-size to message rows. Scrolling blur-variable styles remain unchanged.

Changes

Chat scrolling styles

Layer / File(s)	Summary
Remove message-row containment styles src/renderer/src/pages/ChatPage.vue	Removes scrolling-specific content-visibility and contain-intrinsic-size declarations from message rows while retaining the surrounding scrolling styles.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• ThinkInAIXYZ/deepchat#1912: Refactors related scrolling and active-scrolling styles in ChatPage.vue.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: removing scroll-time content-visibility from chat rows.
Linked Issues check	✅ Passed	The change directly addresses #1919 by removing the scroll-time behavior that caused chat history jumps and gray-screen issues.
Out of Scope Changes check	✅ Passed	The PR is narrowly scoped to the scroll-time CSS removal and does not introduce unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/chat-scroll-jump

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