fix: support non-SGR mouse reporting

[oz-for-oss]

Closes #2906

Summary

• Forward mouse events when a terminal app enables any DEC mouse tracking mode, instead of requiring SGR mouse mode before reporting.
• Add normal and UTF-8 mouse report encoding fallbacks for apps/configurations that do not request SGR mouse encoding.
• Add regression tests for SGR, legacy normal, UTF-8, and out-of-range normal mouse encoding behavior.

Validation

• ./script/format
• cargo test -p warp_terminal escape_sequences
• CARGO_BUILD_JOBS=1 cargo test -p warp test_alt_screen_select_with_sgr_mouse
• cargo clippy -p warp_terminal --all-targets --all-features --tests -- -D warnings
• CARGO_BUILD_JOBS=1 cargo clippy -p warp --tests -- -D warnings

Notes

• Full workspace clippy was attempted with CARGO_BUILD_JOBS=1 cargo clippy --workspace --all-targets --all-features --tests -- -D warnings, but it is currently blocked by existing unrelated dead-code errors in app remote-server/session-sharing code paths.

[oz-for-oss]

@vikvang

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[oz-for-oss]

Overview

This PR broadens alt-screen mouse forwarding so terminal apps can receive legacy normal and UTF-8 mouse reports when they enable DEC mouse tracking without SGR encoding. It also avoids panicking when an out-of-range legacy report cannot be encoded and adds regression coverage for the new encodings.

Concerns

• For this user-facing terminal interaction change, please include screenshots or a short screen recording demonstrating mouse reporting working end to end in a terminal app that uses non-SGR reporting. The description lists tests but does not include visual evidence.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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