fix: spawn pty with actual terminal size

[matiaspalmac]

Changes

The PTY was hardcoded to open at 24 rows × 80 cols in pty.rs. The shell (PowerShell/bash) would then print its first prompt at 80 cols, and the real size only arrived later via resize_pty when the ResizeObserver in Terminal.tsx fired. That mismatch caused the symptom reported in #13 — after commands like ls/dir followed by clear, the prompt rendered with an extra blank and a truncated path.

• apps/desktop/src-tauri/src/pty.rs: spawn_pty now accepts optional rows/cols, falling back to 24×80 if not provided.
• apps/desktop/src/api/tauri.ts: extends the spawn_pty signature accordingly.
• apps/desktop/src/components/Terminal.tsx: stores the FitAddon in a ref so the PTY effect can call fit() before spawning, then passes term.rows/term.cols to spawn_pty so the shell starts at the correct size.

The existing ResizeObserver + resize_pty flow is untouched — it still handles later container resizes.

Issues

• fix Fix: terminal space bug #13

[Copilot]

Pull request overview

Fixes an initial PTY size mismatch by ensuring the shell is spawned with the terminal’s actual rows/cols (instead of a hardcoded 24×80), addressing the prompt rendering artifact described in issue #13.

Changes:

• Extend spawn_pty to accept optional rows/cols (with a 24×80 fallback).
• Update the frontend invoke typing to include the new PTY size parameters.
• Fit the xterm instance before spawning the PTY, then pass the computed term.rows/term.cols into spawn_pty.

Reviewed changes

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

File	Description
apps/desktop/src/components/Terminal.tsx	Stores FitAddon in a ref, calls fit() before spawning, and passes rows/cols to the PTY spawn invoke.
apps/desktop/src/api/tauri.ts	Updates the typed invoke map for spawn_pty to include optional rows/cols.
apps/desktop/src-tauri/src/pty.rs	Updates the Tauri spawn_pty command to size the PTY using provided rows/cols with a default fallback.

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[jmaxdev]

done