feat: add interactive YAML ↔ JSON converter webview

[hilleer]

Opens a persistent split-pane webview panel for converting arbitrary YAML/JSON content without needing a file on disk. Features include:

• Pre-population from the active editor (JSON/YAML files)
• Real-time debounced conversion (300ms)
• Swap, Clear, Copy, and Save As buttons
• Inline error display using VS Code CSS variables
• Singleton panel that re-populates from the active editor on re-invoke
• Editor title bar button (arrow-swap icon) and command palette entry

[Copilot]

Pull request overview

Adds a persistent, interactive YAML ↔ JSON converter webview panel to the extension, with editor pre-population and common utility actions.

Changes:

• Introduces a singleton split-pane webview for real-time YAML/JSON conversion (debounced), with Swap/Clear/Copy/Save As actions.
• Registers a new extension.interactiveConverter command and exposes it via the command palette and editor title bar.
• Updates README with usage/docs and new demo media for the interactive converter.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 4 comments.

File	Description
src/onInteractiveConverter.ts	Implements the interactive converter webview panel, message handling, and Save As / clipboard integration.
src/extension.ts	Registers the new interactive converter command.
package.json	Contributes the new command to the command palette and editor title bar menu.
README.md	Documents the new interactive converter and adds demo assets/sections.

Comments suppressed due to low confidence (1)

package.json:147

• This editor title button will appear broadly in editor contexts because there is no when clause. If the intent is to scope it to text editors (and/or YAML/JSON), add an appropriate when condition (e.g., editorTextFocus and/or resourceLangId == 'yaml' || resourceLangId == 'json' || resourceLangId == 'jsonc') to reduce UI clutter.

			"editor/title": [
				{
					"command": "extension.interactiveConverter",
					"group": "navigation"
				}

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