Add input_select action

[myabc]

Implements the input_select action, which selects the text of target input elements via input.select().

<turbo-stream action="input_select" target="item_1"></turbo-stream>

• Added input_select to src/actions/form.ts and registered it.
• Added test/form/input_select.test.js (target + targets cases).
• Documented under Form Actions in the README.

Closes #53

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a new TurboPower form action, input_select, enabling Turbo Stream messages to select the text inside targeted <input> elements via HTMLInputElement#select().

Changes:

• Implemented input_select in src/actions/form.ts and registered it in registerFormActions.
• Added browser-based tests covering both target and targets selection behavior.
• Documented the new action under “Form Actions” in the README.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/actions/form.ts	Adds and registers the new input_select stream action that calls select() on target inputs.
test/form/input_select.test.js	Verifies input_select selects full text for single and multiple input targets.
README.md	Documents turbo_stream.input_select in the Form Actions list.

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