✨ (examples): Añade ejemplo de formulario

Corrige referencia errónea a `form::input::Field` en ejemplo de Form.

examples/locale/en-US/form-controls.ftl

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+title = Form controls
+slogan = Bootsier form components showcase
+block_selections = Checkboxes, switches and radio buttons
+block_text = Text fields, multiline and range
+block_lists = Select lists and floating labels
+
+fieldset_text = Text fields
+label_name = Full name
+placeholder_name = e.g.: Jane Smith
+label_email = Email address
+placeholder_email = user@example.com
+label_password = Password
+label_phone = Phone number
+placeholder_phone = +1 555 000 0000
+label_url = Website
+placeholder_url = https://example.com
+label_search = Search
+placeholder_search = Search term...
+
+fieldset_textarea = Multiline text
+label_comment = Comment
+placeholder_comment = Write your comment here...
+help_comment = Maximum 500 characters.
+
+fieldset_select = Selection lists
+label_language = Language
+label_country = Country
+label_technologies = Preferred technologies
+help_technologies = Hold Ctrl (or Cmd on Mac) to select multiple options.
+select_choose = — Choose an option —
+select_group_europe = Europe
+select_spanish = Spanish
+select_french = French
+select_group_americas = Americas
+select_english = English
+select_portuguese = Portuguese
+select_disabled = Not available
+select_germany = Germany
+select_spain = Spain
+select_france = France
+select_portugal = Portugal
+
+fieldset_checkbox = Checkboxes and switches
+desc_checkbox = This group shows standard checkboxes, inline checkboxes, reverse-aligned options, and toggle switches for binary choices.
+label_terms = I accept the terms and conditions
+label_marketing = Commercial emails (inline)
+label_newsletter = Newsletter (inline)
+label_notifications = Enable notifications (reverse)
+label_dark_mode = Dark mode (unavailable)
+
+fieldset_radio = Radio buttons
+label_frequency = Newsletter frequency
+radio_daily = Daily
+radio_weekly = Weekly
+radio_monthly = Monthly
+radio_never = Never (disabled)
+
+fieldset_checkgroup = Checkbox group
+label_interests = Areas of interest
+help_interests = Select all options that apply.
+check_rust = Rust programming
+check_web = Web development
+check_ai = Artificial intelligence
+check_games = Game development (disabled)
+
+fieldset_floating = Floating labels
+
+fieldset_range = Slider
+label_rating = Overall rating
+help_rating = From 1 (very poor) to 10 (excellent).
+
+btn_submit = Submit
+btn_reset = Reset
+btn_cancel = Cancel