fix: resize w claude code no flicker (#61)

* fix: mouse resize panel failed with claude-code no flicker

* test: run pane mouse reporting drag tests inside tokio runtime

Switch the new horizontal/vertical drag tests to `#[tokio::test]` so
`PaneRuntime::test_with_screen_bytes` has a reactor when it calls
`tokio::spawn`. CI was panicking with "there is no reactor running".

* test: refresh git state in workspace drop slot test

Workspace::test_new caches the parent repo's git branch at construction
time. On master CI the herdr checkout has ref: refs/heads/master in HEAD,
so the cache is populated and workspace_row_height returns 2. On PR CI
actions/checkout uses a detached merge ref, git_branch returns None, row
height becomes 1, and the drop-slot tie-break flips workspace_drop_index_at_row(2)
from Some(0) to Some(1). Refresh git state after pointing identity_cwd at
the per-test temp repo so the cache reflects the temp repo's HEAD.

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