Implement mini-editor

[AlanRockefeller]

Editor is now small - and can be expanded if more controls are needed.

Summary by CodeRabbit

• New Features

  • Added a compact editor window for streamlined image editing alongside the existing expanded editor
  • Editor can now toggle between compact and expanded modes
  • Compact editor includes histogram display (overlay/channel modes), exposure/shadow/black/color balance controls, and auto-adjustment buttons
  • Enhanced keyboard shortcuts and navigation for both editor modes

• Bug Fixes

  • Improved save and close behavior to prevent unintended editor closures when unsaved edits exist

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ce12c289-0e14-49c2-aee3-f95c684e8e03

📥 Commits

Reviewing files that changed from the base of the PR and between b07bc28 and ebd6ef9.

📒 Files selected for processing (2)

• faststack/app.py
• faststack/qml/CompactEditorWindow.qml

Walkthrough

This PR introduces a compact editor window mode alongside the existing expanded dialog editor. The change adds editor-expansion state tracking, backend dual-mode support through new controller slots, and a complete compact editor UI with histogram and adjustment controls, coordinated via menu actions and keyboard shortcuts.

Changes

Compact Editor and Dual-Mode Editing

Layer / File(s)	Summary
Editor expansion state foundation faststack/ui/provider.py	UIState gains isEditorExpanded property with is_editor_expanded_changed signal and initialization in __init__ to track editor mode (compact vs expanded).
Backend dual-mode integration faststack/app.py	New handle_key_from_compact_editor(), has_unsaved_edits(), and toggle_editor() slots enable compact editor interaction; eventFilter() defers to QML when editor is expanded; save lifecycle updated to only close editor when both open and expanded.
Expanded editor dialog updates faststack/qml/ImageEditorDialog.qml	Dialog visibility now requires both isEditorOpen and isEditorExpanded; new "Compact" button collapses editor to compact mode.
Compact editor window UI faststack/qml/CompactEditorWindow.qml	New 786-line window component with histogram (overlay/channel modes), light/color adjustment sliders with live drag-update, footer controls (Reset/Close/Save), keyboard handlers (Esc/E/S/arrows), unsaved-edits protection, and reusable compact slider delegate.
Main UI menu and shortcut coordination faststack/qml/Main.qml	"Edit Image" menu action coordinates both editor states; E shortcut context changed from application-wide to window-scoped and now clears isEditorExpanded; CompactEditorWindow instantiated with focus restoration on hide.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• AlanRockefeller/faststack#71: Both PRs modify faststack/app.py's save/edit lifecycle—this PR changes editor-close gating in save_edited_image()/_on_save_finished() to require both isEditorOpen and isEditorExpanded, while PR #71 reworks post-save handling and crop-related save flows.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 68.75% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Implement mini-editor' directly and clearly describes the main change: adding a compact/mini editor component, which aligns with the PR's primary objective of implementing a smaller editor that can be expanded.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch Mini-editor

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[chatgpt-codex-connector]

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Reviewed commit: b07bc283d9

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[chatgpt-codex-connector]

Keep compact editor loaded after saving

When saving from the compact editor, editor_was_open is true but isEditorExpanded is false, so this new guard leaves the compact window visible while the following self.image_editor.clear() still unloads the backing image. Because CompactEditorWindow.ensureEditorLoaded() only reloads when currentIndex changes, any subsequent slider movement after a successful Save in the still-open compact editor calls set_edit_parameter() against a cleared editor and is ignored until the user closes/reopens or navigates away.

Useful? React with 👍 / 👎.

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@faststack/app.py`:
- Around line 1074-1083: handle_key_from_compact_editor currently constructs a
QKeyEvent then calls keybinder.handle_key_press directly, bypassing the widget's
eventFilter (and its _dialog_open and mode guards). Instead of calling
keybinder.handle_key_press(event), forward the QKeyEvent through the same event
pipeline used elsewhere so eventFilter runs (e.g., call self.eventFilter(self,
event) or post/send the event via QApplication.postEvent/sendEvent to this
widget) and remove the direct keybinder invocation; this ensures the same guards
and routing logic are applied.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 43eeac72-9324-4868-904e-0c8651c78be9

📥 Commits

Reviewing files that changed from the base of the PR and between 114b0df and b07bc28.

📒 Files selected for processing (5)

• faststack/app.py
• faststack/qml/CompactEditorWindow.qml
• faststack/qml/ImageEditorDialog.qml
• faststack/qml/Main.qml
• faststack/ui/provider.py