Improve session rendering and file mention handling

[andagaev]

• Render issue-backed prompts through Askama and centralize debounced file-index loading.
• Share fuzzy file-entry ranking between runtime selection and UI suggestions.
• Project one coherent FrameTime snapshot per render and inject clock offsets into animations, timers, and activity-day calculations.
• Persist session activity timestamps from the injected clock so local-day aggregation and feature tests stay timezone-independent.
• Patch coverage corrections exercise all affected paths, with 100% local patch coverage and all required Agentty checks passing.

[greptile-apps]

Greptile Summary

This PR refactors several cross-cutting concerns to improve testability and timezone correctness. It introduces a FrameTime snapshot struct that captures a single coherent clock reading per render frame, moves fuzzy file-entry ranking from the infra layer into the domain layer, migrates activity-timestamp aggregation from SQLite localtime to Rust-side clock-injected offsets, and centralises @-mention index loading in TaskService.

• Clock injection end-to-end: SessionLoadInput now carries a Clock reference; record_session_creation_activity calls insert_session_creation_activity_at with the injected clock's timestamp; FrameTime consumes a single clock.now_system_time() call and threads unix_seconds, unix_millis, and local_utc_offset_seconds through all render paths, eliminating multiple independent SystemTime::now() reads per frame.
• Domain-layer fuzzy ranking: filter_entries and its scoring helpers are moved from infra/file_index.rs to domain/file_entry.rs, letting the runtime at-mention handler and UI suggestion rendering share the same ranking logic without depending on the infra layer.
• Issue-session prompt templating: The hardcoded format!("Address this issue: {issue_url}") call is replaced with a compiled Askama template, with a matching unit test asserting the rendered output.

Confidence Score: 5/5

Safe to merge — the changes are a well-tested structural refactoring with no behaviour changes in production paths.

All changes are either moving code between modules without altering logic, or wiring an already-tested clock abstraction through new call sites. The removed SQLite localtime aggregation is replaced by an equivalent Rust-side calculation that is independently unit-tested with fixed-offset clock fixtures, including a boundary test at day transitions. The new FrameTime snapshot eliminates clock drift between render sub-calls. No database schema changes, no new external dependencies, and all former API surface consumers are updated consistently.

No files require special attention. The activity aggregation migration (load.rs, activity.rs) is the highest-complexity change and is covered by the new record_session_creation_activity_uses_injected_clock and daily_activity_uses_clock_offset_for_each_timestamp tests.

_{Reviews (6): Last reviewed commit: "Improve session rendering and file menti..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud