fix: 修复无法在大文档展开的限制

[Nomikfk1215]

Summary

• seed the mention index with a shallow bounded scan so @ completion can respond before full traversal finishes
• run full mention index rebuilds in the background with explicit partial/building/ready stats
• surface mention index state in the TUI palette footer

Tests

• go test ./internal/mention ./tui
• go test ./...

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 39 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/mention/index.go	75.18%	21 Missing and 12 partials ⚠️
tui/component_palettes.go	40.00%	6 Missing ⚠️

📢 Thoughts on this report? Let us know!

[fennoai]

Automated review completed. No actionable findings from code quality, performance, security, or documentation passes.

[Nomikfk1215]

@xgopilot 修复补充当前codecov覆盖率不足的问题

[fennoai]

Summary

Added test-only coverage fixes for the progressive mention index changes.

• internal/mention/index_test.go: added coverage for Prewarm, seed truncation/visit-limit behavior, and readMentionSeedDir edge cases.
• tui/model_test.go: added coverage for mention palette footer states when the index is partial or building.
• Validation completed with go test ./internal/mention ./tui, go test ./..., and a follow-up coverage run showing tui/component_palettes.go at 97.4% and internal/mention/readMentionSeedDir improved to 92.3%.

Push Result

Changes were committed and pushed here:

• Commit: c52720b
• Fork PR: test: raise coverage for progressive mention index Nomikfk1215/bytemind#7

No production code was changed.

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