feat: track API profile per session for per-profile stats (#32)

[ourines]

Summary

• Add Profile field to SessionRecord, populated with config.Default at scan time (falls back to "unknown")
• Add ByProfile map[string]float64 to DailyStat for per-profile cost aggregation
• Add ProfileCost struct, ProfileBreakdown() function, and TopProfiles to Summary
• TUI Stats tab: f key now cycles all → project → model → profile → all

Changes

File	What changed
internal/stats/types.go	Profile on SessionRecord, ByProfile on DailyStat, ProfileCost struct, TopProfiles on Summary
internal/stats/scanner.go	Load config.Default at scan time and pass to parseSessionFile
internal/stats/aggregator.go	Populate ByProfile in Aggregate, add ProfileBreakdown(), include in GenerateSummary
internal/tui/stats_view.go	Add profile to f-key cycle, aggregateByProfile(), "By Profile:" render section

Test plan

• go vet ./... — no errors
• go test ./... — all tests pass
• Manual: codes → Stats tab → press f repeatedly to cycle through all/project/model/profile views

Summary by CodeRabbit

New Features

• Profile cost tracking: Sessions now record the API profile used, enabling costs to be aggregated and displayed by profile.
• Enhanced stats view: Added "By Profile" breakdown option to display top profiles by cost, cycling through project, model, and profile views.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The changes introduce profile-level cost tracking throughout the stats system. Profiles are detected from config during session scanning, accumulated in daily stats aggregations, exposed via a ProfileBreakdown function, and rendered in the TUI alongside existing project and model breakdowns.

Changes

Cohort / File(s)	Summary
Data Model Enhancements internal/stats/types.go	Adds Profile field to SessionRecord, ByProfile map to DailyStat, TopProfiles list to Summary, and new ProfileCost type for cost aggregation by profile.
Profile Detection & Propagation internal/stats/scanner.go	Detects default user profile from config, propagates it through ScanSessions, and passes it to parseSessionFile where it's assigned to SessionRecord.Profile. Adds file close handling via defer.
Profile Cost Aggregation internal/stats/aggregator.go	Accumulates costs by profile in DailyStat.ByProfile during aggregation, adds ProfileBreakdown function to compute total costs by profile across all stats, and exposes TopProfiles in GenerateSummary output.
TUI Profile Breakdown Display internal/tui/stats_view.go	Adds aggregateByProfile function and renders "By Profile" section in stats view. Extends breakdown cycling to include profile option and updates help text and labels accordingly.

Sequence Diagram

sequenceDiagram
    participant Scanner as Session Scanner
    participant Config as Config System
    participant Aggregator as Stats Aggregator
    participant TUI as TUI Display

    Scanner->>Config: Load default user profile
    Config-->>Scanner: Return profile (or "unknown")
    
    Scanner->>Scanner: ScanSessions with currentProfile
    Scanner->>Scanner: parseSessionFile(..., profile)
    Scanner->>Scanner: Create SessionRecord with Profile field
    
    Scanner->>Aggregator: Pass SessionRecord with profile
    Aggregator->>Aggregator: Accumulate costs to DailyStat.ByProfile
    Aggregator->>Aggregator: ProfileBreakdown(dailyStats)
    Aggregator-->>Aggregator: Return sorted []ProfileCost
    
    Aggregator->>Aggregator: GenerateSummary with TopProfiles
    Aggregator-->>TUI: Summary containing TopProfiles
    
    TUI->>TUI: aggregateByProfile(dailyStats)
    TUI->>TUI: Render "By Profile" section
    TUI-->>TUI: Display profile costs sorted

Loading

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related issues

• feat: track API profile per session for per-profile stats #32: Directly addresses profile-level tracking feature with SessionRecord.Profile addition, DailyStat.ByProfile aggregation, scanner profile propagation, and TUI profile breakdown rendering.

Poem

🐰 Hop along with profiles clear,
Each session's cost now tracked right here,
From scanner's detection to UI's glow,
Profile breakdowns steal the show! ✨

✨ Finishing Touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/issue-32-profile-tracking

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