fix: enhance session pinning behavior and update related tests

[zhangmo8]

fix pinning hero animation

Summary by CodeRabbit

Release Notes

Improvements

• Refined animations when pinning and unpinning sessions with smoother visual transitions and better placeholder positioning
• Improved session reordering in the sidebar to correctly reflect pin status changes
• Session metadata now updates accurately when toggling pin status

[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: 08aab5d0-8a87-4554-9590-c9bf10f259d5

📥 Commits

Reviewing files that changed from the base of the PR and between 889c1d5 and 321188f.

📒 Files selected for processing (5)

• src/renderer/src/components/WindowSideBar.vue
• src/renderer/src/components/WindowSideBarSessionItem.vue
• src/renderer/src/stores/ui/session.ts
• test/renderer/components/WindowSideBar.test.ts
• test/renderer/stores/sessionStore.test.ts

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📝 Walkthrough

Walkthrough

Pin-flight animations now measure from a dedicated hero placeholder element that settles across animation frames rather than directly measuring the target. WindowSideBarSessionItem accepts a new heroPlaceholder prop; WindowSideBar passes it conditionally based on pinFlightSessionId. DOM helpers measure element positions, wait for placeholder stabilization, and generate dynamic keyframes based on pinned state. Session store now updates updatedAt timestamps during pin toggles to support ordering.

Changes

Pin-flight placeholder animation

Layer / File(s)	Summary
Placeholder prop and rendering src/renderer/src/components/WindowSideBarSessionItem.vue	heroPlaceholder optional prop added; root element gains data-pin-placeholder attribute derived from prop.
Placeholder types and animation constants src/renderer/src/components/WindowSideBar.vue	New SessionItemRegion and SessionItemRect types, plus timing/tolerance constants (PIN_FLIGHT_DURATION_MS, settle-frame limits, pixel epsilon) for measurement and stabilization.
Placeholder prop passing from parent src/renderer/src/components/WindowSideBar.vue	Pinned and grouped session items receive hero-placeholder prop conditional on pinFlightSessionId.
DOM measurement and placeholder settlement helpers src/renderer/src/components/WindowSideBar.vue	New functions locate and measure session items/placeholders, compare bounding rects, wait asynchronously for placeholder stabilization across animation frames with fallback, and generate animation options/keyframes based on pinned state.
Updated animatePinFlight implementation src/renderer/src/components/WindowSideBar.vue	animatePinFlight uses typed region values, retrieves target via placeholder settlement waiter instead of direct measurement, handles missing-target errors, and applies dynamically-generated keyframes and animation options instead of hardcoded values.
Session timestamp update on pin toggle src/renderer/src/stores/ui/session.ts	toggleSessionPinned now captures and applies updatedAt timestamp to sessions list, bootstrapActiveSession, and activeSessionSummary alongside isPinned updates.
Test infrastructure and validation test/renderer/components/WindowSideBar.test.ts, test/renderer/stores/sessionStore.test.ts	Added createDomRect helper, global stub cleanup in afterEach, sessionClient toggleSessionPinned mock, and test cases validating session reordering on pin/unpin with time-based grouping.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• ThinkInAIXYZ/deepchat#1391: Adds overall pin-flight animation and hero/placeholder state via heroHidden and data attributes; this PR builds on that foundation with placeholder-settling logic and dynamic keyframe generation.
• ThinkInAIXYZ/deepchat#1473: Also modifies pin-flight animation in WindowSideBar and session state, but with focus on docked/overlay pin states (forcePinDocked, pinDockedSessionId) rather than placeholder-based measurement.

Poem

🐰 A placeholder waits and settles so,
Through animation frames it learns to flow.
The sessions dance to dynamic beats,
While timestamps mark their ordered seats! 🎬✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main changes: enhancing session pinning behavior (the core fix for pin-flight animation and state management) and updating related tests, which aligns with the substantial modifications across multiple files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

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