feat: add bulk editor for headers, params, form data, and env vars

[bajrangCoder]

Summary

• Add Bulk Edit mode for request headers, query params, form URL-encoded fields, and environment variables.
• Toggle with the pen icon (enter bulk) and table icon (return to tabular view).
• Bulk format is plain key: value (also accepts key=value); prefix with # to disable.
• Register a custom highlighter language (kv) via tree-sitter-properties so keys, separators, values, and comments color correctly without enabling the full tree-sitter language pack.
• Apply bulk text back into the row model when leaving bulk mode (env vars preserve secret flags by matching keys).

[Copilot]

Pull request overview

This PR introduces a “Bulk Edit” text mode across multiple editors (headers, query params, form-url-encoded data, and environment variables), backed by a shared key/value text parser/serializer and a lightweight custom syntax highlighter registration.

Changes:

• Added Bulk Edit toggle + code-editor UI for headers, query params, form data, and environment variables.
• Implemented src/utils/bulk_kv.rs for parsing/serializing key: value (and key=value) lines, with support for disabled entries and highlighting via tree-sitter-properties.
• Added an entity API to replace environment variables in bulk (EnvironmentsEntity::set_variables) and registered the kv highlighter at app startup.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/views/environment_view.rs	Adds bulk editor UI/state and applies bulk text back into environment variables while preserving secret flags by matching keys.
src/utils/mod.rs	Exposes the new bulk-kv utilities and registration function from the utils module.
src/utils/bulk_kv.rs	Introduces bulk key/value parsing + serialization and a kv syntax highlighter registration with tests.
src/entities/environment.rs	Adds set_variables API used by environment bulk edit to replace variables wholesale.
src/components/params_editor.rs	Adds bulk editor UI/state for query params and conversion between table rows and bulk text.
src/components/header_editor.rs	Adds bulk editor UI/state for headers and integration with programmatic header upserts.
src/components/form_data_editor.rs	Adds bulk editor UI/state for form-url-encoded fields and conversion between rows and bulk text.
src/app.rs	Registers the kv highlighter on app init so bulk editors can use it.
Cargo.toml	Adds tree-sitter-properties dependency for bulk editor highlighting.
Cargo.lock	Updates lockfile for the new dependency and transitive version changes.

Comments suppressed due to low confidence (1)

src/components/header_editor.rs:324

• In bulk mode, set_or_update_header parses and re-serializes the entire bulk editor content. This round-trip normalizes formatting and can delete or mutate user-entered blank lines / comment-only lines, causing unexpected data loss while the user is editing.

        if self.bulk_mode {
            let mut entries = self
                .bulk_editor
                .as_ref()
                .map(|editor| parse_bulk_kv(&editor.read(cx).text().to_string()))

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