UX improvements and quick dalec spec generation

[ashu8912]

What this PR does / why we need it:

This PR tackles various UX issues like showing notification when a dalec build request is received also trims unnecessary output from terminal when asking for a build. It also adds a quick way to generate dalec spec.

[Copilot]

Pull request overview

This PR enhances the user experience of the Dalec VS Code extension by adding notification messages when builds start, improving dialog persistence with ignoreFocusOut, and removing verbose terminal output. It also introduces a new command and snippets for quickly generating Dalec spec files, along with improvements to path handling for better debugging support.

Changes:

• Added notification messages when build/debug/rerun actions start to provide better user feedback
• Added ignoreFocusOut: true to all input dialogs to prevent accidental dismissal when focus is lost
• Removed terminal comment prefix output (simplified terminal display) and removed unused getTerminalCommentPrefix function
• Implemented new "Dalec: New Spec" command and added code snippets for scaffolding Dalec specifications
• Modified path handling to use absolute paths for Docker commands and added DAP message rewriting for proper breakpoint support
• Auto-save dirty documents before building/debugging
• Added artifact target detection to output RPM/DEB builds to local directories
• Simplified JSON schema for the revision field to use a simpler type array syntax

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/extension.ts	Registered new createNewSpec command for generating Dalec spec templates
src/commands/createNewSpec/createNewSpec.ts	New command implementation that opens a YAML document with a basic Dalec spec template
src/commands/runBuildCurrentSpecCommand/runBuildCommand.ts	Added auto-save, notification messages, absolute path handling, DAP message rewriting, and debug image metadata resolution
src/commands/runBuildCurrentSpecCommand/helpers/dapHelpers.ts	Refactored DAP message handling to rewrite paths between absolute (VS Code) and relative (Docker) formats
src/commands/runBuildCurrentSpecCommand/helpers/targetHelpers.ts	Added ignoreFocusOut: true to target picker dialogs
src/commands/runBuildCurrentSpecCommand/helpers/contextHelpers.ts	Added ignoreFocusOut: true to context and args input dialogs
src/commands/runBuildCurrentSpecCommand/utils/pathHelpers.ts	Modified getWorkspaceRootForUri to fallback to file directory for non-workspace files; updated getWorkspaceRelativeFsPath to handle workspace-relative paths
src/commands/runBuildCurrentSpecCommand/utils/dockerHelpers.ts	Changed to use absolute paths for spec files and context, added artifact target detection with local output, commented out noCache functionality
src/commands/runBuildCurrentSpecCommand/utils/terminalHelpers.ts	Removed unused getTerminalCommentPrefix function
src/commands/reRunLastAction/reRunLastAction.ts	Added notification message and removed terminal comment output
snippets/dalec.code-snippets	Added code snippets for Dalec spec scaffolding, git sources, docker image sources, and build steps
schemas/spec.schema.json	Simplified revision field type definition from oneOf structure to simple type array
package.json	Added breakpoints configuration for YAML, registered new createNewSpec command, and added snippets configuration

Comments suppressed due to low confidence (1)

src/extension.ts:75

• Command registrations on lines 63, 67, 69-74 are not added to context.subscriptions, but the first command registration (line 59) is. This inconsistency could lead to resource leaks when the extension is deactivated, as these commands won't be properly disposed. All command registrations should be added to context.subscriptions.push() for proper cleanup.

	vscode.commands.registerCommand('dalec-vscode-tools.debugCurrentSpec', (uri?: vscode.Uri) =>
      runDebugCommand(uri, tracker, lastAction),
    );

	vscode.commands.registerCommand('dalec-vscode-tools.createNewSpec', () => createNewSpec());

	vscode.commands.registerCommand('dalec-vscode-tools.rerunLastAction', () => rerunLastAction(tracker, lastAction)),
    vscode.commands.registerCommand('dalec-vscode-tools.rerunLastActionBuild', () =>
      rerunLastAction(tracker, lastAction, 'build'),
    ),
    vscode.commands.registerCommand('dalec-vscode-tools.rerunLastActionDebug', () =>
      rerunLastAction(tracker, lastAction, 'debug'),
    ),

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