Description

Release 1 (can be split). Smaller niceties: (a) auto-close pairs — typing '[','(','backtick' inserts the closing char with the cursor inside; typing the closing char over an auto-inserted one steps over it; (b) smart Home — first press goes to the first non-whitespace column, second to column 0; (c) go-to-line command/prompt; (d) remember cursor position per file within a session (reopening returns to it); (e) paste a URL over a selection -> selection.

Acceptance Criteria

• #1 Auto-close pairs for [] () and backticks (with step-over)
• #2 Smart Home (first non-blank, then col 0)
• #3 Go-to-line; per-file cursor memory; paste-URL-over-selection