fix: paste with Ctrl+V into Search & Replace fields (#1960)

[sinelaw]

Fixes #1960.

Problem

The project Search & Replace panel (Command Palette → "Search and Replace in Project") runs the focused buffer in a search-replace-list mode whose host-side text-input handler in app/input.rs swallows every Ctrl/Alt-modified key. As a result Ctrl+V never reached the Paste action and users could not paste into the search or replace fields — a real blocker for any non-typable input (UTF-8 characters, long values from outside the editor, regexes, etc.).

Fix

Three small changes, all confined to host-side input/clipboard routing:

1. app/input.rs text-input-mode handler — when a Ctrl/Alt-modified character key reaches the text-input bypass, resolve it against the Normal context first and let only Action::Paste through. Other normal bindings (Ctrl+O open-file, Ctrl+S save, …) stay blocked, so the search field is not promoted to a global command bar.
2. app/input.rs Action::Paste handler — route paste through the focused widget input before the editing_disabled guard, since the Search & Replace results buffer is a read-only virtual buffer and the existing guard would otherwise short-circuit.
3. app/clipboard.rs::paste_text + app/plugin_dispatch.rs — when the active buffer hosts a widget panel with a focused text widget, paste into the widget via a new paste_into_focused_widget helper. Newlines are flattened to spaces for single-line widgets; multi-line widgets receive the clipboard text verbatim.

The fix preserves the original safety property of the text-input-mode bypass (random Ctrl-shortcuts cannot leak through) by allowing only the Paste action.

Tests

Two new e2e tests in tests/e2e/search_replace.rs:

• test_search_replace_paste_into_search_field — set the internal clipboard to "jovial", open the panel, press Ctrl+V, assert the search field contains "jovial".
• test_search_replace_paste_into_replace_field — same flow but Tab to the replace field first.

Both tests hang on master (the action never fires, so "jovial" never appears on the screen) and pass with this change. Manual validation in tmux: copying "hello" from the buffer, opening Search & Replace, clearing the prefilled field, and pressing Ctrl+V successfully populates the search field and finds the expected match.

Test plan

• cargo test -p fresh-editor --test e2e_tests search_replace — 25 pass / 2 ignored
• cargo test -p fresh-editor --test e2e_tests paste — 63 pass / 2 ignored
• cargo check --all-targets -p fresh-editor — clean
• cargo fmt --check — clean
• Manual tmux validation against the release binary

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