type: user

role: user

content:
Fix a real bug in `apps/birdseye/internal/tui/browser.go` inside worktree `/Users/steve.briggs/projects/operations/.claude/worktrees/birdseye`.

## The Bug

In `Browser.Update`, the `tea.KeyRunes` switch cases for "j" and "k" call `b.Move(...)` but do NOT return. Execution falls through to `b.viewport.Update(msg)` at the bottom of the function. The bubbles viewport's default keymap also binds "j"/"k" to scroll the content, so each press both navigates files AND scrolls the viewport — a double-processing bug.

## The Fix

In `apps/birdseye/internal/tui/browser.go`, locate this block:

```go
case "j":
    b.Move(1)
case "k":
    b.Move(-1)
```

Change to:

```go
case "j":
    b.Move(1)
    return b, nil
case "k":
    b.Move(-1)
    return b, nil
```

## Add a Regression Test

Append to `apps/birdseye/internal/tui/browser_test.go`:

```go
func TestBrowserJKDoesNotForwardToViewport(t *testing.T) {
	b := NewBrowser(sampleResult())
	b.SetSize(120, 30)
	// Press "j" — should advance selection and NOT return a tea.Cmd
	// (a non-nil cmd would indicate the message was forwarded to the
	// viewport, which would scroll the diff content as a side effect).
	_, cmd := b.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'j'}})
	if b.SelectedIndex() != 1 {
		t.Errorf("after j: index = %d, want 1", b.SelectedIndex())
	}
	if cmd != nil {
		t.Errorf("expected nil cmd (no viewport forward); got %v", cmd)
	}
	_, cmd = b.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'k'}})
	if b.SelectedIndex() != 0 {
		t.Errorf("after k: index = %d, want 0", b.SelectedIndex())
	}
	if cmd != nil {
		t.Errorf("expected nil cmd (no viewport forward); got %v", cmd)
	}
}
```

## Verify

- [ ] `cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go test -race ./... -v` — all tests pass, including the new one
- [ ] `go vet ./...` clean

## Commit

```bash
cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye && git add apps/birdseye/internal/tui/browser.go apps/birdseye/internal/tui/browser_test.go && git commit -m "fix(birdseye): prevent j/k double-processing through viewport in browser"
```

## Report

- **Status:** DONE | BLOCKED
- Test result
- Commit SHA

userType: external

entrypoint: cli

gitBranch: worktree-birdseye


content:
- migrate-flux-app: Use when migrating a Flux CD application from the infrastructure/kubernetes/application-deployments repo to the application-deployment repo. Covers copying app folders, updating kustomizations, committing, pushing, and creating merge requests.
- app-infra-generate: Generate an application-infrastructure Terraform module from a YAML spec produced by app-infra-spec. Reads pattern files and a versions manifest to produce main.tf, variables.tf, outputs.tf, overlay guidance, and a triage list.
- app-infra-spec: Structured questionnaire to gather requirements for an application-infrastructure Terraform module. Produces a YAML spec for the app-infra-generate skill.
- obsidian-load: Load context from Obsidian notes in the `Claude/` directory into the current conversation.
- obsidian-save: Save current conversation context to an Obsidian note under the `Claude/` directory.
- mind:search: Search memories for specific content or patterns
- mind:stats: Show memory statistics and storage information
- mind:recent: Show recent memories and activity timeline
- mind:ask: Ask questions about memories and get context-aware answers
- superpowers:using-git-worktrees: Use when starting feature work that needs isolation from current workspace or before executing implementation plans - ensures an isolated workspace exists via native tools or git worktree fallback
- superpowers:receiving-code-review: Use when receiving code review feedback, before implementing suggestions, especially if feedback seems unclear or technically questionable - requires technical rigor and verification, not performative agreement or blind implementation
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- superpowers:verification-before-completion: Use when about to claim work is complete, fixed, or passing, before committing or creating PRs - requires running verification commands and confirming output before making any success claims; evidence before assertions always
- superpowers:brainstorming: You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior. Explores user intent, requirements and design before implementation.
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- superpowers:test-driven-development: Use when implementing any feature or bugfix, before writing implementation code
- superpowers:subagent-driven-development: Use when executing implementation plans with independent tasks in the current session
- mind:memory: Claude Mind - Search and manage Claude's persistent memory stored in a single portable .mv2 file
- mind:mind: Claude Mind - Search and manage Claude's persistent memory stored in a single portable .mv2 file
- update-config: Use this skill to configure the Claude Code harness via settings.json. Automated behaviors ("from now on when X", "each time X", "whenever X", "before/after X") require hooks configured in settings.json - the harness executes these, not Claude, so memory/preferences cannot fulfill them. Also use for: permissions ("allow X", "add permission", "move permission to"), env vars ("set X=Y"), hook troubleshooting, or any changes to settings.json/settings.local.json files. Examples: "allow npm commands", "add bq permission to global settings", "move permission to user settings", "set DEBUG=true", "when claude stops show X". For simple settings like theme/model, suggest the /config command.
- keybindings-help: Use when the user wants to customize keyboard shortcuts, rebind keys, add chord bindings, or modify ~/.claude/keybindings.json. Examples: "rebind ctrl+s", "add a chord shortcut", "change the submit key", "customize keybindings".
- simplify: Review changed code for reuse, quality, and efficiency, then fix any issues found.
- fewer-permission-prompts: Scan your transcripts for common read-only Bash and MCP tool calls, then add a prioritized allowlist to project .claude/settings.json to reduce permission prompts.
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- schedule: Create, update, list, or run scheduled remote agents (routines) that execute on a cron schedule. - When the user wants to schedule a recurring remote agent, set up automated tasks, create a cron job for Claude Code, or manage their scheduled agents/routines. Also use when the user wants a one-time scheduled run ("run this once at 3pm", "remind me to check X tomorrow").
- claude-api: Build, debug, and optimize Claude API / Anthropic SDK apps. Apps built with this skill should include prompt caching. Also handles migrating existing Claude API code between Claude model versions (4.5 → 4.6, 4.6 → 4.7, retired-model replacements).
TRIGGER when: code imports `anthropic`/`@anthropic-ai/sdk`; user asks for the Claude API, Anthropic SDK, or Managed Agents; user adds/modifies/tunes a Claude feature (caching, thinking, compaction, tool use, batch, files, citations, memory) or model (Opus/Sonnet/Haiku) in a file; questions about prompt caching / cache hit rate in an Anthropic SDK project.
SKIP: file imports `openai`/other-provider SDK, filename like `*-openai.py`/`*-generic.py`, provider-neutral code, general programming/ML.
- init: Initialize a new CLAUDE.md file with codebase documentation
- review: Review a pull request
- security-review: Complete a security review of the pending changes on the current branch

type: attachment


type: message

role: assistant

type: text

text: I'll fix this bug systematically. Let me start by reading the relevant files.

service_tier: standard

attributionAgent: general-purpose

attributionPlugin: superpowers

type: assistant


Read

type: direct


speed: standard


content:
1	package tui
2
3	import (
4		"strings"
5
6		tea "github.com/charmbracelet/bubbletea"
7		"github.com/charmbracelet/bubbles/viewport"
8		"github.com/charmbracelet/lipgloss"
9
10		"github.com/immuta/operations/apps/birdseye/internal/diff"
11	)
12
13	// Browser is the multi-pane diff viewer: file tree on the left,
14	// rendered unified diff on the right, footer at the bottom.
15	type Browser struct {
16		result   diff.Result
17		theme    Theme
18		selected int
19		width    int
20		height   int
21		viewport viewport.Model
22	}
23
24	// NewBrowser builds a Browser from a pre-computed Result. SetSize must
25	// be called once before the first View() so the viewport sizes itself.
26	func NewBrowser(r diff.Result) *Browser {
27		vp := viewport.New(0, 0)
28		return &Browser{
29			result:   r,
30			theme:    DefaultTheme(),
31			viewport: vp,
32		}
33	}
34
35	// SetSize informs the browser of the terminal dimensions.
36	func (b *Browser) SetSize(w, h int) {
37		b.width, b.height = w, h
38		fileTreeW := 32
39		if w < 80 {
40			fileTreeW = 24
41		}
42		contentW := w - fileTreeW - 4
43		contentH := h - 2
44		if contentW < 10 {
45			contentW = 10
46		}
47		if contentH < 5 {
48			contentH = 5
49		}
50		b.viewport.Width = contentW
51		b.viewport.Height = contentH
52		b.refreshViewport()
53	}
54
55	// SelectedIndex returns the currently focused file diff index.
56	func (b *Browser) SelectedIndex() int { return b.selected }
57
58	// SelectedFile returns the FileDiff at the current selection. Falls
59	// back to a zero value when the result has no files.
60	func (b *Browser) SelectedFile() diff.FileDiff {
61		if len(b.result.Files) == 0 {
62			return diff.FileDiff{}
63		}
64		return b.result.Files[b.selected]
65	}
66
67	// Move adjusts the selection by delta, clamping to the valid range, and
68	// refreshes the viewport content.
69	func (b *Browser) Move(delta int) {
70		if len(b.result.Files) == 0 {
71			return
72		}
73		b.selected += delta
74		if b.selected < 0 {
75			b.selected = 0
76		}
77		if b.selected >= len(b.result.Files) {
78			b.selected = len(b.result.Files) - 1
79		}
80		b.refreshViewport()
81	}
82
83	func (b *Browser) refreshViewport() {
84		if len(b.result.Files) == 0 {
85			b.viewport.SetContent("no differences")
86			return
87		}
88		b.viewport.SetContent(b.colorizeUnified(b.SelectedFile().Unified))
89		b.viewport.GotoTop()
90	}
91
92	func (b *Browser) colorizeUnified(unified string) string {
93		var sb strings.Builder
94		for _, line := range strings.Split(unified, "\n") {
95			switch {
96			case strings.HasPrefix(line, "@@"):
97				sb.WriteString(b.theme.HunkHeader.Render(line))
98			case strings.HasPrefix(line, "+") && !strings.HasPrefix(line, "+++"):
99				sb.WriteString(b.theme.AddedLine.Render(line))
100			case strings.HasPrefix(line, "-") && !strings.HasPrefix(line, "---"):
101				sb.WriteString(b.theme.RemovedLine.Render(line))
102			default:
103				sb.WriteString(line)
104			}
105			sb.WriteByte('\n')
106		}
107		return sb.String()
108	}
109
110	// Init satisfies tea.Model. No initial cmd — browser is purely reactive.
111	func (b *Browser) Init() tea.Cmd { return nil }
112
113	// Update handles key presses and window-resize messages.
114	func (b *Browser) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
115		switch msg := msg.(type) {
116		case tea.WindowSizeMsg:
117			b.SetSize(msg.Width, msg.Height)
118			return b, nil
119		case tea.KeyMsg:
120			switch msg.Type {
121			case tea.KeyDown:
122				b.Move(1)
123				return b, nil
124			case tea.KeyUp:
125				b.Move(-1)
126				return b, nil
127			case tea.KeyRunes:
128				switch string(msg.Runes) {
129				case "q":
130					return b, tea.Quit
131				case "j":
132					b.Move(1)
133				case "k":
134					b.Move(-1)
135				}
136			}
137		}
138		// Forward to viewport for scroll handling.
139		var cmd tea.Cmd
140		b.viewport, cmd = b.viewport.Update(msg)
141		return b, cmd
142	}
143
144	// View renders the full multi-pane layout.
145	func (b *Browser) View() string {
146		tree := b.renderTree()
147		right := b.theme.Viewport.Render(b.viewport.View())
148		body := lipgloss.JoinHorizontal(lipgloss.Top, tree, right)
149		footer := b.theme.Footer.Render("j/k or ↑/↓ move · q quit · esc back")
150		return lipgloss.JoinVertical(lipgloss.Left, body, footer)
151	}
152
153	func (b *Browser) renderTree() string {
154		var sb strings.Builder
155		for i, fd := range b.result.Files {
156			marker := " "
157			switch fd.Status {
158			case diff.StatusAdded:
159				marker = b.theme.StatusAdd.Render("+")
160			case diff.StatusRemoved:
161				marker = b.theme.StatusDel.Render("-")
162			case diff.StatusModified:
163				marker = b.theme.StatusMod.Render("~")
164			}
165			line := marker + " " + fd.Path
166			if i == b.selected {
167				line = b.theme.FileSelected.Render(line)
168			} else {
169				line = b.theme.FileTreeItem.Render(line)
170			}
171			sb.WriteString(line)
172			sb.WriteByte('\n')
173		}
174		if len(b.result.Files) == 0 {
175			sb.WriteString("(no files)")
176		}
177		return b.theme.FileTree.Render(sb.String())
178	}
179


content:
1	package tui
2
3	import (
4		"testing"
5
6		tea "github.com/charmbracelet/bubbletea"
7
8		"github.com/immuta/operations/apps/birdseye/internal/diff"
9	)
10
11	func sampleResult() diff.Result {
12		return diff.Result{Files: []diff.FileDiff{
13			{Path: "a.tf", Status: diff.StatusModified, Unified: "@@\n-x\n+y\n", Adds: 1, Dels: 1},
14			{Path: "b.tf", Status: diff.StatusAdded, Unified: "+++ b.tf\n+new\n", Adds: 1},
15		}}
16	}
17
18	func TestNewBrowserDefaults(t *testing.T) {
19		b := NewBrowser(sampleResult())
20		if b.SelectedIndex() != 0 {
21			t.Errorf("default selected index = %d, want 0", b.SelectedIndex())
22		}
23		if b.SelectedFile().Path != "a.tf" {
24			t.Errorf("first selected = %s", b.SelectedFile().Path)
25		}
26	}
27
28	func TestBrowserViewContainsBothFiles(t *testing.T) {
29		b := NewBrowser(sampleResult())
30		b.SetSize(120, 30)
31		view := b.View()
32		for _, want := range []string{"a.tf", "b.tf"} {
33			if !contains(view, want) {
34				t.Errorf("view missing %q\n%s", want, view)
35			}
36		}
37	}
38
39	func contains(s, sub string) bool {
40		for i := 0; i+len(sub) <= len(s); i++ {
41			if s[i:i+len(sub)] == sub {
42				return true
43			}
44		}
45		return false
46	}
47
48	func TestBrowserMovesDownAndUp(t *testing.T) {
49		b := NewBrowser(sampleResult())
50		b.SetSize(120, 30)
51		m, _ := b.Update(tea.KeyMsg{Type: tea.KeyDown})
52		b2 := m.(*Browser)
53		if b2.SelectedIndex() != 1 {
54			t.Errorf("after down: index = %d, want 1", b2.SelectedIndex())
55		}
56		m, _ = b2.Update(tea.KeyMsg{Type: tea.KeyUp})
57		b3 := m.(*Browser)
58		if b3.SelectedIndex() != 0 {
59			t.Errorf("after up: index = %d, want 0", b3.SelectedIndex())
60		}
61	}
62
63	func TestBrowserQuitMessage(t *testing.T) {
64		b := NewBrowser(sampleResult())
65		b.SetSize(120, 30)
66		_, cmd := b.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'q'}})
67		if cmd == nil {
68			t.Fatal("expected tea.Quit cmd")
69		}
70		if got, want := cmd(), tea.Quit(); got != want {
71			t.Errorf("cmd msg = %v, want %v", got, want)
72		}
73	}
74


text: Good. I can see the bug clearly. Now I'll apply the fix and add the regression test.


Edit

old_string:
			case "j":
				b.Move(1)
			case "k":
				b.Move(-1)

new_string:
			case "j":
				b.Move(1)
				return b, nil
			case "k":
				b.Move(-1)
				return b, nil


content: The file /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/internal/tui/browser.go has been updated successfully. (file state is current in your context — no need to Read it back)


text: Now append the regression test to browser_test.go.


old_string:
func TestBrowserQuitMessage(t *testing.T) {
	b := NewBrowser(sampleResult())
	b.SetSize(120, 30)
	_, cmd := b.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'q'}})
	if cmd == nil {
		t.Fatal("expected tea.Quit cmd")
	}
	if got, want := cmd(), tea.Quit(); got != want {
		t.Errorf("cmd msg = %v, want %v", got, want)
	}
}

new_string:
func TestBrowserQuitMessage(t *testing.T) {
	b := NewBrowser(sampleResult())
	b.SetSize(120, 30)
	_, cmd := b.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'q'}})
	if cmd == nil {
		t.Fatal("expected tea.Quit cmd")
	}
	if got, want := cmd(), tea.Quit(); got != want {
		t.Errorf("cmd msg = %v, want %v", got, want)
	}
}

func TestBrowserJKDoesNotForwardToViewport(t *testing.T) {
	b := NewBrowser(sampleResult())
	b.SetSize(120, 30)
	// Press "j" — should advance selection and NOT return a tea.Cmd
	// (a non-nil cmd would indicate the message was forwarded to the
	// viewport, which would scroll the diff content as a side effect).
	_, cmd := b.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'j'}})
	if b.SelectedIndex() != 1 {
		t.Errorf("after j: index = %d, want 1", b.SelectedIndex())
	}
	if cmd != nil {
		t.Errorf("expected nil cmd (no viewport forward); got %v", cmd)
	}
	_, cmd = b.Update(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'k'}})
	if b.SelectedIndex() != 0 {
		t.Errorf("after k: index = %d, want 0", b.SelectedIndex())
	}
	if cmd != nil {
		t.Errorf("expected nil cmd (no viewport forward); got %v", cmd)
	}
}


content: The file /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye/internal/tui/browser_test.go has been updated successfully. (file state is current in your context — no need to Read it back)


text: Now run the tests and vet.


Bash

command: cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go test -race ./... -v 2>&1

description: Run all tests with race detector, verbose


content:
?   	github.com/immuta/operations/apps/birdseye	[no test files]
=== RUN   TestDiffPlainOutput
--- PASS: TestDiffPlainOutput (0.01s)
=== RUN   TestDiffIdenticalVersionsNoChanges
--- PASS: TestDiffIdenticalVersionsNoChanges (0.01s)
=== RUN   TestDiffBadModuleAddress
--- PASS: TestDiffBadModuleAddress (0.00s)
=== RUN   TestExitCode
=== RUN   TestExitCode/nil
=== RUN   TestExitCode/not-found
=== RUN   TestExitCode/wrapped-not-found
=== RUN   TestExitCode/context-cancelled
=== RUN   TestExitCode/context-deadline
=== RUN   TestExitCode/generic
--- PASS: TestExitCode (0.00s)
    --- PASS: TestExitCode/nil (0.00s)
    --- PASS: TestExitCode/not-found (0.00s)
    --- PASS: TestExitCode/wrapped-not-found (0.00s)
    --- PASS: TestExitCode/context-cancelled (0.00s)
    --- PASS: TestExitCode/context-deadline (0.00s)
    --- PASS: TestExitCode/generic (0.00s)
=== RUN   TestNewRootCmdHelp
--- PASS: TestNewRootCmdHelp (0.00s)
=== RUN   TestNewRootCmdDefaults
--- PASS: TestNewRootCmdDefaults (0.00s)
=== RUN   TestVersionsCmd
--- PASS: TestVersionsCmd (0.00s)
PASS
ok  	github.com/immuta/operations/apps/birdseye/cmd	1.694s
=== RUN   TestExtractHappyPath
--- PASS: TestExtractHappyPath (0.00s)
=== RUN   TestExtractEmptyArchive
--- PASS: TestExtractEmptyArchive (0.00s)
=== RUN   TestExtractMalformedGzip
--- PASS: TestExtractMalformedGzip (0.00s)
=== RUN   TestExtractZipSlip
=== RUN   TestExtractZipSlip/../evil.tf
=== RUN   TestExtractZipSlip/./../../etc/passwd
=== RUN   TestExtractZipSlip/a/../../etc/passwd
--- PASS: TestExtractZipSlip (0.00s)
    --- PASS: TestExtractZipSlip/../evil.tf (0.00s)
    --- PASS: TestExtractZipSlip/./../../etc/passwd (0.00s)
    --- PASS: TestExtractZipSlip/a/../../etc/passwd (0.00s)
=== RUN   TestExtractAbsolutePath
--- PASS: TestExtractAbsolutePath (0.00s)
=== RUN   TestExtractTooLarge
--- PASS: TestExtractTooLarge (0.00s)
=== RUN   TestExtractIgnoresSymlinks
--- PASS: TestExtractIgnoresSymlinks (0.00s)
PASS
ok  	github.com/immuta/operations/apps/birdseye/internal/archive	(cached)
=== RUN   TestTextualAdded
--- PASS: TestTextualAdded (0.00s)
=== RUN   TestTextualRemoved
--- PASS: TestTextualRemoved (0.00s)
=== RUN   TestTextualModified
--- PASS: TestTextualModified (0.00s)
=== RUN   TestTextualIdenticalReturnsEmpty
--- PASS: TestTextualIdenticalReturnsEmpty (0.00s)
=== RUN   TestTextualSortedByPath
--- PASS: TestTextualSortedByPath (0.00s)
PASS
ok  	github.com/immuta/operations/apps/birdseye/internal/diff	(cached)
=== RUN   TestMemCacheRoundTrip
--- PASS: TestMemCacheRoundTrip (0.00s)
=== RUN   TestDiskCacheMissThenHit
--- PASS: TestDiskCacheMissThenHit (0.00s)
=== RUN   TestDiskCacheSurvivesNewInstance
--- PASS: TestDiskCacheSurvivesNewInstance (0.00s)
=== RUN   TestRegistryFetchCacheMiss
--- PASS: TestRegistryFetchCacheMiss (0.00s)
=== RUN   TestRegistryFetchCacheHitSkipsNetwork
--- PASS: TestRegistryFetchCacheHitSkipsNetwork (0.00s)
=== RUN   TestRegistryFetchNotFound
--- PASS: TestRegistryFetchNotFound (0.00s)
=== RUN   TestRegistryFetchPair
--- PASS: TestRegistryFetchPair (0.00s)
=== RUN   TestRegistryFetchPairOneMissing
--- PASS: TestRegistryFetchPairOneMissing (0.00s)
PASS
ok  	github.com/immuta/operations/apps/birdseye/internal/registry	(cached)
=== RUN   TestNewBrowserDefaults
--- PASS: TestNewBrowserDefaults (0.00s)
=== RUN   TestBrowserViewContainsBothFiles
--- PASS: TestBrowserViewContainsBothFiles (0.00s)
=== RUN   TestBrowserMovesDownAndUp
--- PASS: TestBrowserMovesDownAndUp (0.00s)
=== RUN   TestBrowserQuitMessage
--- PASS: TestBrowserQuitMessage (0.00s)
=== RUN   TestBrowserJKDoesNotForwardToViewport
--- PASS: TestBrowserJKDoesNotForwardToViewport (0.00s)
PASS
ok  	github.com/immuta/operations/apps/birdseye/internal/tui	1.810s


text: All tests pass. Now run vet.


command: cd /Users/steve.briggs/projects/operations/.claude/worktrees/birdseye/apps/birdseye && go vet ./... 2>&1

description: Run go vet on all packages


content: (Bash completed with no output)


text: Clean. Now commit.


command:
git add apps/birdseye/internal/tui/browser.go apps/birdseye/internal/tui/browser_test.go && git commit -m "$(cat <<'EOF'
fix(birdseye): prevent j/k double-processing through viewport in browser

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
EOF
)"

description: Commit the bug fix and regression test


content:
[worktree-birdseye 3f29025] fix(birdseye): prevent j/k double-processing through viewport in browser
 2 files changed, 24 insertions(+)


text:
**Status: DONE**

**What was fixed:**

In `/apps/birdseye/internal/tui/browser.go`, the `tea.KeyRunes` cases for `"j"` and `"k"` were missing `return b, nil` after calling `b.Move(...)`. Without the early return, execution fell through to `b.viewport.Update(msg)` at the bottom of `Update`, causing the bubbles viewport's built-in `j`/`k` scroll bindings to also fire — double-processing each keypress.

Added `return b, nil` after each `b.Move(...)` call, consistent with the already-correct `tea.KeyDown` and `tea.KeyUp` cases above them.

**Regression test added:** `TestBrowserJKDoesNotForwardToViewport` in `browser_test.go` — verifies that pressing `j`/`k` advances the selection index correctly and returns a `nil` cmd (meaning the message was not forwarded to the viewport).

**Test result:** All 5 TUI tests pass, all other package tests pass, `go vet` clean.

**Commit SHA:** `3f29025`