Fix run.sh credentials path resolution

[kodjima33]

Summary

• CREDS_PATH used $BACKEND_DIR (relative ./Backend-Rust) after the script had already cd'd into Backend-Rust/, causing it to look for Backend-Rust/Backend-Rust/google-credentials.json
• Use $(pwd) instead since we're already in the right directory

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR fixes a one-line bug in desktop/run.sh where the CREDS_PATH variable was constructed using $BACKEND_DIR — a relative path (e.g., ./Backend-Rust) — after the script had already cd'd into that directory. This caused the resolved path to be Backend-Rust/Backend-Rust/google-credentials.json (doubling the directory segment), leading to an immediate exit 1 with "Missing credentials file."

The fix replaces $BACKEND_DIR with $(pwd), which always yields the absolute path of the current working directory. Since the cd "$BACKEND_DIR" on line 151 has already changed the CWD to Backend-Rust/, $(pwd) correctly resolves to the credentials file.

Key observations:

• The root cause is that BACKEND_DIR was set as a relative path ($(dirname "$0")/Backend-Rust) but was reused after a cd, where relative paths are resolved against the new CWD.
• The fix is minimal, correct, and well-scoped.
• A complementary long-term hardening approach would be to resolve BACKEND_DIR to an absolute path at declaration time (e.g., BACKEND_DIR="$(cd "$(dirname "$0")/Backend-Rust" && pwd)"), which would make all subsequent usages of $BACKEND_DIR safe regardless of cd calls — but this is a style concern, not a blocker.

Confidence Score: 5/5

• This PR is safe to merge — it is a targeted, correct bug fix with no risk of regression.
• The change is a single-line fix that replaces a relative-path variable with $(pwd) after a cd, which is the correct and standard shell idiom for this situation. The logic is straightforward and verifiable by reading the surrounding context. No new behaviour is introduced; only the broken credentials path resolution is corrected.
• No files require special attention.

Important Files Changed

Filename	Overview
desktop/run.sh	Single-line fix: replaces $BACKEND_DIR/google-credentials.json with $(pwd)/google-credentials.json after the script has already cd'd into Backend-Rust/, correctly resolving the credentials path that was previously doubling the directory segment.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Script starts\nCWD = desktop/"] --> B["BACKEND_DIR = './Backend-Rust'\n(line 77)"]
    B --> C["cd '$BACKEND_DIR'\nCWD = desktop/Backend-Rust/\n(line 151)"]
    C --> D_OLD["❌ OLD: CREDS_PATH = '$BACKEND_DIR/google-credentials.json'\n= './Backend-Rust/google-credentials.json'\n(relative to CWD → Backend-Rust/Backend-Rust/google-credentials.json)"]
    C --> D_NEW["✅ NEW: CREDS_PATH = '$(pwd)/google-credentials.json'\n= '/abs/path/to/Backend-Rust/google-credentials.json'\n(absolute path — always correct)"]
    D_OLD --> E_OLD["❌ File not found → exit 1"]
    D_NEW --> E_NEW["✅ File found → export GOOGLE_APPLICATION_CREDENTIALS"]
    E_NEW --> F["Start Rust backend"]

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