feat: add per-pane default foreground/background color support (#4737)

* feat: add per-pane default foreground/background color support

Add per-pane default foreground and background colors, configurable
through four surfaces:

- OSC 10/11 escape sequences (set/query) and OSC 110/111 (reset)
- CLI action: zellij action set-pane-color --pane-id <id> --fg/--bg
- Layout config: default_fg/default_bg properties on pane nodes
- Plugin API: set_pane_color() SDK function and PaneInfo read-side

Colors are applied at render time as a fallback when cells have no
explicit foreground/background, without mutating stored grid data.

Closes #4712

* refactor: address review feedback for pane color support

- Extract adjust_styles_for_custom_bg_fg in output/mod.rs
- Move color parsing (xparse_color) from tab into Grid
- Move color serialization (ansi_code_to_color_string) into Grid
- Pane trait now uses Option<String> for color getters/setters
- Add colors to session serialization (dump-layout)
- Add default_fg/default_bg to protobuf IPC schema to fix
  layout-in-session color loss
- Update example layout with tab-bar and status-bar

* fix stack overflow and ordering

* rustfmt

* update e2e snapshots

---------

Co-authored-by: Karl Bunch <karl@karlbunch.com>
Co-authored-by: Aram Drevekenin <aram@poor.dev>

1 files changed, 3 insertions, 0 deletions

diff --git a/xtask/src/build.rs b/xtask/src/build.rs
index c5c54fca..e8baee09 100644
--- a/xtask/src/build.rs
+++ b/xtask/src/build.rs
@@ -77,6 +77,7 @@ pub fn build(sh: &Shell, flags: flags::Build) -> anyhow::Result<()> {
                     }
                 }
             }
+            proto_files.sort();
             if needs_regeneration {
                 prost
                     .compile_protos(&proto_files, &[protobuf_source_dir])
@@ -122,6 +123,7 @@ pub fn build(sh: &Shell, flags: flags::Build) -> anyhow::Result<()> {
                     }
                 }
             }
+            proto_files.sort();
             if needs_regeneration {
                 prost
                     .compile_protos(&proto_files, &[client_server_contract_dir])
@@ -166,6 +168,7 @@ pub fn build(sh: &Shell, flags: flags::Build) -> anyhow::Result<()> {
                     }
                 }
             }
+            proto_files.sort();
             if needs_regeneration {
                 prost
                     .compile_protos(&proto_files, &[web_server_contract_dir])