feat(editor): add copy text action for toggle and list blocks

[HarishKolla1]

Feature Preview

Adds a "Copy text" action to the block menu for toggle, bulleted list, and numbered list blocks.

Users can copy the block text directly from the 3-dot menu, similar to Notion.

Fixes #8800

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Add a block menu action to copy the plain text content of selected blocks in the editor.

New Features:

• Introduce a Copy text option in the block action menu for applicable editor blocks to copy their text content to the clipboard.

Enhancements:

• Ensure Copy text operates on the current block or all blocks in a block selection and normalizes their text content before copying.

[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Reviewer's Guide

Adds a new Copy text block action and wires it through the block actions enum, UI configuration, and cubit to copy the selected block(s) plain text to the clipboard.

Sequence diagram for the new Copy text block action

sequenceDiagram
  actor User
  participant BlockMenu
  participant BlockActionOptionCubit
  participant EditorState
  participant ClipboardService

  User->>BlockMenu: tap OptionAction.copyText
  BlockMenu->>BlockActionOptionCubit: emit OptionAction.copyText with node
  BlockActionOptionCubit->>BlockActionOptionCubit: _copyText(node)
  BlockActionOptionCubit->>EditorState: selectionType
  BlockActionOptionCubit->>EditorState: selection
  alt selectionType == SelectionType.block and selection != null
    BlockActionOptionCubit->>EditorState: getNodesInSelection(selection.normalized)
  else
    BlockActionOptionCubit->>BlockActionOptionCubit: use [node] as nodes
  end
  loop for each n in nodes
    BlockActionOptionCubit->>BlockActionOptionCubit: n.delta
    BlockActionOptionCubit->>BlockActionOptionCubit: delta.toPlainText()
  end
  BlockActionOptionCubit->>ClipboardService: setData(ClipboardServiceData)
  ClipboardService-->>BlockActionOptionCubit: clipboard updated
  BlockActionOptionCubit->>BlockActionOptionCubit: emit(BlockActionOptionState())

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File-Level Changes

Change	Details	Files
Introduce a Copy text option action that maps to an icon and label and is included in the standard block actions list for supported block types.	Extend the OptionAction enum with a copyText value. Associate the new action with the FlowySvgs.text_s icon in the optionIcon getter. Provide a user-facing label for the new action and add it to the standardActions list built in editor configuration.	frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/actions/option/option_actions.dart frontend/appflowy_flutter/lib/plugins/document/presentation/editor_configuration.dart
Implement behavior for the Copy text action to copy the plain text of the current or selected blocks to the clipboard and trigger a UI update.	Add handling of the copyText case in BlockActionOptionCubit.onAction to call a new _copyText helper. Implement _copyText to resolve either the single node or all nodes in the current block selection, concatenate their delta plain text with newlines, and push it to ClipboardService. Emit a fresh BlockActionOptionState after copying to cause the UI to refresh.	frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/actions/block_action_option_cubit.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8800	Add a 'Copy text' action to the 3-dot block menu for toggle, bulleted list, and numbered list blocks.	✅
#8800	Implement functionality so that the 'Copy text' action copies the text content of the selected toggle or list block(s) to the clipboard.	✅

Possibly linked issues

• [FR] Notion-like copy ability #8800: PR adds the requested 'Copy text' action in the 3-dot menu for toggle and list blocks.

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[sourcery-ai]

Hey - I've left some high level feedback:

• The OptionAction.copyText label is currently hard-coded as 'Copy text'; consider adding a localized key (similar to copyLinkToBlock) so it respects the existing i18n setup.
• copyText is added to standardActions for all block types in _buildOptionActions, but the description suggests it should apply only to toggle and list blocks; consider restricting it to the relevant block types to avoid exposing it where it may not behave as expected.
• In _copyText, you always join block texts with a newline and include empty strings when delta is null; consider filtering out nodes without delta and trimming leading/trailing newlines so the clipboard content is cleaner.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `OptionAction.copyText` label is currently hard-coded as `'Copy text'`; consider adding a localized key (similar to `copyLinkToBlock`) so it respects the existing i18n setup.
- `copyText` is added to `standardActions` for all block types in `_buildOptionActions`, but the description suggests it should apply only to toggle and list blocks; consider restricting it to the relevant block types to avoid exposing it where it may not behave as expected.
- In `_copyText`, you always join block texts with a newline and include empty strings when `delta` is null; consider filtering out nodes without `delta` and trimming leading/trailing newlines so the clipboard content is cleaner.

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