fix: repeat copy-mode navigation keys

[ogulcancelik]

Summary

• repeat copy-mode arrow, Page Up/Down, Home, and End input when terminals report explicit repeat events
• keep confirm, exit, prefix, and other modal actions single-shot
• preserve input-source ownership with a copy-navigation-specific consumed lease

Reproduction

macOS Ghostty reports held arrows as Kitty Repeat events; Linux Ghostty reports repeated presses. Before this change, the macOS Ghostty → SSH path moved once. The patched build repeats continuously.

Tests

• just check
• automated macOS Ghostty → SSH validation: held Up changed copy-mode scroll offset from 0 to 53

Refs #2371

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📝 Walkthrough

Walkthrough

Copy-mode navigation now supports explicit terminal key-repeat events for arrows, Page Up/Down, Home, and End. Dedicated input leases route these events through copy-mode handling while preserving existing repeat behavior for other keys.

Changes

Copy-navigation repeat handling

Layer / File(s)	Summary
Navigation repeat contract and test src/app/input/copy_mode.rs	AppState permits repeats only for selected navigation keys in copy mode. The test validates repeated arrow movement and cursor clamping.
Repeat lease disposition src/app/input/lease.rs	ConsumedInputLease records copy-navigation repeats. The lease table identifies these leases and excludes them from generic repeat planning.
Press and repeat event routing src/app/mod.rs, src/app/runtime.rs, docs/next/CHANGELOG.md	Input routing records copy-navigation leases on key presses and replays repeat events while copy mode remains active. The changelog documents the supported keys.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Terminal
  participant AppState
  participant InputLeaseTable
  participant CopyModeHandler
  Terminal->>AppState: Send key press
  AppState->>InputLeaseTable: Record RepeatCopyNavigation
  Terminal->>AppState: Send KeyEventKind::Repeat
  AppState->>InputLeaseTable: Check copy-navigation lease
  AppState->>CopyModeHandler: Replay navigation repeat_count times

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Possibly related issues

• Copy mode: allow held-key repeat for cursor-movement keys (keep suppressing confirm/exit repeat) #2371 — Covers the same copy-mode key-repeat behavior and repeat suppression paths.

Possibly related PRs

• herdrdev/herdr#2142 — Provides the input-lease repeat-routing system extended by this change.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the primary change: repeating navigation keys in copy mode.
Description check	✅ Passed	The description directly explains the copy-mode repeat behavior, preserved single-shot actions, input lease handling, reproduction, and tests.

✨ Finishing Touches

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• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/copy-mode-arrow-repeat

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🧹 Nitpick comments (1)

src/app/input/copy_mode.rs (1)

1187-1199: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Add coverage for both repeat routers.

This test exercises App::route_client_input, which covers the headless routing path. The PR also changes src/app/runtime.rs, and the allowlist includes PageUp, PageDown, Home, and End. Add one runtime-path test and cases for the remaining allowlisted keys.

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📥 Commits

Reviewing files that changed from the base of the PR and between eb93ec8 and 3638cce.

📒 Files selected for processing (5)

• docs/next/CHANGELOG.md
• src/app/input/copy_mode.rs
• src/app/input/lease.rs
• src/app/mod.rs
• src/app/runtime.rs

[ogulcancelik]

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