SQL-S3 — SQLite Connection Form (SqliteConnectionForm)

[ZhuchkaTriplesix]

Epic: #194
Depends on: #198 (SQL-S1)
Source: docs/planned-0.4.5.md

Goal

Create the UI form for setting up a SQLite connection, including a native OS file picker and a "Read-Only" mode toggle.

Files

• lib/shared/widgets/connection_forms/sqlite_connection_form.dart (new)

Implementation

• Implement SqliteConnectionForm widget.
• Integrate the native file picker via file_selector package to select .db, .sqlite, or .sqlite3 files.
• Add a path text field (with manual edit capability) and a "Browse" button.
• Add a "Read-Only" switch/checkbox (defaults to true for safety).
• Add "Test Connection" and "Save" button actions.

Acceptance Criteria

• Clicking "Browse" opens native file dialog on Linux, macOS, and Windows.
• File selection populates the database path.
• Read-only flag is properly passed to connection configuration.
• "Test Connection" verifies connection status.
• Code is clean and passes flutter analyze.