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-# TUI Dashboard Table Sorting Plan
-
-## Overview
-
-Add column-driven sorting to the dashboard table views for:
-
-- `3:Syscalls`
-- `4:Files`
-- `5:Processes`
-
-This is a **table-view-only** feature. Bubble, treemap, and icicle modes keep
-their existing ordering rules.
-
-The task wording says "sort by any row", but the current dashboard already
-tracks both a selected row and a selected column. This plan therefore treats
-`s` as **sort by the currently selected column/cell**.
-
-Pressing `s`:
-
-1. on a new selected column enables that column's sort order
-2. again on the same selected column clears the custom sort and restores the
-   tab's current default ordering
-
-## Current Behavior
-
-The dashboard already has the key pieces needed for this feature:
-
-- `internal/tui/dashboard/model.go`
-  - stores row selection and selected column for Syscalls, Files, and Processes
-  - routes table navigation with `left/right` and `h/l`
-- `internal/tui/dashboard/syscalls.go`
-  - renders the syscall table from `snap.Syscalls()`
-- `internal/tui/dashboard/files.go`
-  - renders both the file table and the grouped-directory table
-- `internal/tui/dashboard/processes.go`
-  - renders the process table
-
-The current default ordering comes from the snapshot producers:
-
-- Syscalls: `Count desc`, then `Name asc`
-- Files: `Accesses desc`, then `Path asc`
-- Grouped directories: `Accesses desc`, then `Directory asc`
-- Processes: `Syscalls desc`, then `Bytes desc`, then `PID asc`
-
-That ordering should remain the baseline whenever no custom sort is active.
-
-## Design Goals
-
-- `s` sorts by the selected column in table mode.
-- `s` on the same selected column toggles back to the default ranking.
-- `Enter` continues to act on the row currently visible on screen after sorting.
-- Sorting stays in the dashboard layer; `statsengine` snapshot semantics do not
-  change.
-- Selection remains anchored to the same logical entity when sorting changes.
-- Width changes do not corrupt sort state for the Syscalls tab.
-
-## UX Rules
-
-- `s` is active only for sortable dashboard tables:
-  - Syscalls table mode
-  - Files table mode
-  - Files directory-grouped table mode
-  - Processes table mode
-- `s` does nothing in:
-  - Overview
-  - Latency+Gaps
-  - Stream
-  - Flame
-  - bubble/treemap/icicle modes
-- Table footer hints should add `s:sort`.
-- The footer should also show the active sort, for example:
-  - `sort: default`
-  - `sort: p95 desc`
-  - `sort: Path asc`
-- Expanded help should mention `s` so the feature is discoverable.
-
-## State Model
-
-Add dashboard-local sort state per table shape.
-
-Example shape:
-
-```go
-type tableSortState[K comparable] struct {
-    active bool
-    key    K
-}
-```
-
-Recommended fields on `dashboard.Model`:
-
-- `syscallsSort`
-- `filesSort`
-- `filesDirSort`
-- `processesSort`
-
-`Files` needs **two** sort states because the tab has two different table
-schemas:
-
-- file rows
-- grouped directory rows
-
-Those states should persist independently when `d` toggles between files and
-directories.
-
-## Logical Sort Keys
-
-Do **not** store the raw selected column index as the sort identifier.
-
-The Syscalls table changes shape by width:
-
-- narrow layout: `Syscall Count Rate/s Avg p95 p99 Bytes Errors`
-- wide layout: `Syscall Count Rate/s Avg Min Max p50 p95 p99 Bytes Errors`
-
-If sort state stored only a column index, resizing from narrow to wide would
-turn "sort by p95" into "sort by Min". The sort state must therefore use a
-stable logical key enum, and map the current visible column index to that enum
-at keypress time.
-
-Recommended enums:
-
-- `syscallSortKey`
-- `fileSortKey`
-- `fileDirSortKey`
-- `processSortKey`
-
-## Column Ordering Rules
-
-Use a fixed natural direction per logical column. This avoids inventing a
-three-state cycle and matches the task requirement of "sort" plus "toggle back".
-
-### Syscalls
-
-- `Syscall`: `Name asc`
-- `Count`: `Count desc`
-- `Rate/s`: `RatePerSec desc`
-- `Avg`: `LatencyMeanNs desc`
-- `Min`: `LatencyMinNs desc`
-- `Max`: `LatencyMaxNs desc`
-- `p50`: `LatencyP50Ns desc`
-- `p95`: `LatencyP95Ns desc`
-- `p99`: `LatencyP99Ns desc`
-- `Bytes`: `Bytes desc`
-- `Errors`: `Errors desc`
-
-### Files
-
-- `Accesses`: `Accesses desc`
-- `Read`: `BytesRead desc`
-- `Write`: `BytesWritten desc`
-- `Avg Latency`: `AvgLatencyNs desc`
-- `Max Latency`: `MaxLatencyNs desc`
-- `Path`: `Path asc`
-
-### Grouped Directories
-
-- `Accesses`: `Accesses desc`
-- `Read`: `BytesRead desc`
-- `Write`: `BytesWritten desc`
-- `Avg Latency`: `AvgLatencyNs desc`
-- `Max Latency`: `MaxLatencyNs desc`
-- `Files`: `FileCount desc`
-- `Directory`: `Dir asc`
-
-### Processes
-
-- `PID`: `PID asc`
-- `Comm`: `Comm asc`
-- `Syscalls`: `Syscalls desc`
-- `Rate/s`: `RatePerSec desc`
-- `Total Bytes`: `Bytes desc`
-- `Avg Latency`: `AvgLatencyNs desc`
-
-## Comparator Rules
-
-For deterministic output, custom comparators should fall back to the existing
-default ranking for that row type.
-
-Examples:
-
-- `p95 desc`, then syscall default order
-- `Path asc`, then file default order
-- `Comm asc`, then process default order
-
-This keeps ties stable and makes the "toggle back to default" behavior
-predictable.
-
-## Selection Anchoring
-
-Changing sort order must not leave the cursor on the same numeric row index if
-that index now points to a different entity.
-
-Before toggling sort:
-
-1. capture the currently selected logical entity key
-2. recompute the sorted rows
-3. restore the selected row to the same entity in the new order
-4. if the entity no longer exists, clamp as today
-
-Recommended identity keys:
-
-- Syscalls: `Name`
-- Files: `Path`
-- Grouped directories: `Dir`
-- Processes: `PID`
-
-This same anchor logic should run on refresh ticks while custom sorting is
-active so the selected item does not drift unpredictably as live stats change.
-
-## Implementation Shape
-
-Keep the sorting logic in `internal/tui/dashboard`, not in `internal/statsengine`.
-
-Reason:
-
-- snapshot order is part of the existing aggregate ranking behavior
-- only the table presentation needs alternate ordering
-- bubble/treemap/icicle already have their own ordering rules
-
-Recommended implementation split:
-
-- `internal/tui/common/keys.go`
-  - add a `Sort` binding for `s`
-  - include it in dashboard help output
-- `internal/tui/dashboard/model.go`
-  - add per-table sort state
-  - handle `s`
-  - ignore `s` outside sortable table modes
-  - preserve selection anchors when sort changes
-  - make `selectedSyscallFilter`, `selectedFileFilter`, and
-    `selectedProcessSnapshot` read from the same sorted rows used by rendering
-- `internal/tui/dashboard/syscalls.go`
-  - add syscall sort key mapping from visible column index
-  - add sorted syscall row helper
-  - expose active sort label for footer hints
-- `internal/tui/dashboard/files.go`
-  - add file and directory sort key helpers
-  - keep file and grouped-directory comparators separate
-- `internal/tui/dashboard/processes.go`
-  - add process sort key helpers and sorted row helper
-- `internal/tui/dashboard/table.go`
-  - extend footer hints/status rendering as needed for the active sort label
-
-## Rendering/Data Consistency
-
-The most important implementation rule is:
-
-**the rendered rows and the row-selection actions must use the exact same sorted
-slice**
-
-Without this, the UI can show one row while `Enter` filters a different row.
-
-The safest approach is to centralize each table's sorted typed rows in helper
-functions and use those helpers in both:
-
-- render paths
-- selected-row action paths
-
-## Files Tab Details
-
-The Files tab needs one extra rule beyond Syscalls and Processes:
-
-- in plain file mode, sorting operates on `[]statsengine.FileSnapshot`
-- in directory-grouped mode, sorting operates on `[]DirSnapshot`
-
-The two modes should not share a single sort key because their columns differ.
-Switching with `d` should preserve:
-
-- last file-table custom sort
-- last directory-table custom sort
-
-## Interaction With Existing Features
-
-- `Enter`
-  - still filters the currently selected visible row
-- `d`
-  - only changes Files table shape; custom sort state persists per mode
-- `v`
-  - custom sort state persists, but only applies when returning to table mode
-- `b`
-  - unaffected; bubble/treemap ordering remains metric-driven
-- terminal resize
-  - sort state persists because it stores logical keys, not raw indices
-- trace restart / filter apply
-  - sort state should remain as view state
-
-## Testing Plan
-
-Add focused tests in `internal/tui/dashboard` and `internal/tui/common`.
-
-### Model behavior
-
-- `s` on Syscalls enables a column sort.
-- `s` on the same Syscalls column restores default sorting.
-- `s` on Processes does nothing in non-table modes.
-- `s` on Files uses file-mode sort state when `filesDirGrouped == false`.
-- `s` on Files uses directory-mode sort state when `filesDirGrouped == true`.
-- changing sort preserves the selected entity instead of only the row index.
-
-### Width-sensitive syscall behavior
-
-- sorting by `p95` in narrow mode survives a resize into wide mode
-- sorting by `Syscall` or `Count` maps correctly in both layouts
-
-### Selection action consistency
-
-- `selectedSyscallFilter()` uses sorted syscall rows
-- `selectedFileFilter()` uses sorted file or directory rows
-- `selectedProcessSnapshot()` uses sorted process rows in table mode
-
-### Help/footer rendering
-
-- expanded help includes `s`
-- table footer includes `s:sort`
-- active sort label is visible in the table footer
-
-### Negative cases
-
-- `s` does nothing on Overview / Stream / Flame / Latency+Gaps
-- `s` does nothing for bubble / treemap / icicle views
-
-## Recommended Delivery Order
-
-1. add key binding and sort state plumbing in `dashboard.Model`
-2. implement sorted typed-row helpers per tab
-3. switch render paths and selected-row actions to the shared helpers
-4. add footer/help output
-5. add regression tests for sort toggling, width changes, and selected-row
-   action consistency
-
-## Non-Goals
-
-- no change to snapshot generation order in `statsengine`
-- no sortable Overview or Latency+Gaps tables
-- no ascending/descending toggle cycle beyond "custom sort" vs "default"
-- no behavior change for bubble/treemap/icicle ordering