fix(i18n): track the locale catalogs as build inputs

[zmingxie]

Summary

• rust_i18n::i18n!("../openlogi-ui/locales", …) reads the catalogs at macro-expansion time, and Cargo does not track a proc macro's file reads. No build script declared them as inputs, so editing a translation did not rebuild the binaries that embed it — the stale catalog stayed compiled in until something unrelated recompiled the crate.
• Worth noting the consequence for the i18n gate: the_shared_catalog_is_wired_up in the overlay and agent, which .claude/rules/i18n.md names as the check that a catalog is wired up, can pass against a stale catalog. So that gate is not currently load-bearing.

Changes

• openlogi-desktop, openlogi-agent, openlogi-overlay — each build.rs now emits cargo:rerun-if-changed=../openlogi-ui/locales. In the agent and overlay the directive has to precede the non-Windows early return, or it is never emitted on the platforms that actually build those binaries.

Testing

Before, on b6634915:

$ cargo build -p openlogi-desktop          # warm the build
$ touch crates/openlogi-ui/locales/en.toml
$ cargo build -p openlogi-desktop
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.03s

No recompile, so the embedded catalog kept the old strings. After this change the same sequence gives:

   Compiling openlogi-desktop v0.8.3 (/Users/mxie/dev/OpenLogi/crates/openlogi-desktop)

Verified the same way for openlogi-overlay and openlogi-agent — both of which need the pre-guard placement to work off Windows.

Found while building a locale change for #1116: cargo xtask ci was green and the bundle built, yet the GUI binary still contained the pre-edit string.

cargo xtask ci on macOS/aarch64: 9 passed, 0 failed. Not run on this host and not claimed green — shell (needs shellcheck/shfmt), tests (linux) (Linux-only), cargo-deny (not installed; no dependency change here).

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no outstanding correctness or repository-rule issues.

Summary

This PR ensures binaries embedding translations are rebuilt whenever the shared locale catalogs change.

• Adds the shared locale directory as a Cargo build input for the agent, desktop, and overlay crates.
• Emits the directive before platform-specific early returns so non-Windows builds also track catalog changes.
• Covers every binary currently invoking rust_i18n::i18n! against the shared catalog.

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