Jaayden Halko 5ab25b3ff6 fix(site): add a custom copy/paste menu to the web terminal (#26015)
## Summary

Fixes [CODAGT-415](https://linear.app/codercom/issue/CODAGT-415).

Right-clicking selected text in the web terminal on Windows (and Linux)
showed
the browser's image actions ("Copy image", "Save image as") instead of
copy/paste. The terminal uses xterm.js with the canvas/WebGL renderer,
so the
underlying element is a `<canvas>`, which Chromium and Firefox treat as
an
image. xterm.js tries to retarget the menu by moving a hidden textarea
under
the cursor, but on Windows and Linux the browser's own non-native
context menu
locks onto the canvas before that workaround lands.

## Change

Wrap the terminal in the shared Radix `ContextMenu` so right-click shows
a
custom **Copy** / **Paste** menu instead of the browser default:

- **Copy** reuses the existing copy-on-select clipboard path
(`getSelection()`
  + `copyToClipboard`). It is disabled when there is no selection.
- **Paste** reads the clipboard and uses xterm's `paste()`, which
respects
  bracketed-paste mode.
- The menu is gated to non-macOS (`disabled={isMac()}` on the trigger).
macOS
renders native context menus that already expose working copy/paste
across
  Chrome, Firefox, and Safari, so its default is left untouched.

## Platform scope

| Platform | Behavior |
| --- | --- |
| Windows (Chromium / Firefox) | Custom Copy/Paste menu (fixes the bug)
|
| Linux (Chromium / Firefox) | Custom Copy/Paste menu |
| macOS (Chrome / Firefox / Safari) | Native menu preserved (already
works) |

## Testing

- `TerminalPage.test.tsx`: on non-macOS, right-click suppresses the
native menu
  and shows the Copy/Paste menu; on macOS the native menu is preserved.
- `TerminalPage.stories.tsx`: new `RightClickMenu` story opens the menu
via a
  `play` function for real-browser and visual coverage.
- `tsc`, `biome`, and `make pre-commit` (gen/fmt/lint/build) pass
locally.

<details>
<summary>Decision log</summary>

- The issue was originally reported as Windows-only. Hands-on testing
confirmed
macOS is not affected: Chrome, Firefox, and Safari on macOS all show a
working
copy/paste menu. The difference is the menu implementation: macOS uses
native
  OS context menus (which pick up xterm's repositioned textarea), while
Chromium/Firefox on Windows and Linux draw their own menu that targets
the
  `<canvas>` directly.
- Root cause is the canvas/WebGL renderer plus the unreliability of
xterm's
textarea-repositioning workaround on non-native menus, not the operating
  system itself.
- A custom menu (rather than just `preventDefault`) was chosen so users
keep an
  explicit copy/paste affordance on the affected platforms. A bare
  `preventDefault` removes the menu entirely.
- Scope is gated to non-macOS to avoid regressing the working native
menu on
macOS. Rejected alternatives: suppressing/replacing on all platforms
(regresses
macOS), and Windows-only (misses Linux, which shares the same non-native
menu).

</details>

---

Generated by Coder Agents on behalf of @jaaydenh.
2026-06-11 09:12:15 +01:00
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