chore: tidy up and harden .gitignore

[jvsena42]

Summary

Consolidates and expands .gitignore, which had accumulated duplicate entries (*.log twice, the Android Studio block twice, captures/ three times) and was missing rules for real build output that was leaking into git status.

The immediate trigger: composeApp/release/baselineProfiles/**/*.dm showed up as untracked. The existing rule was .dm, which matches a file named .dm — not the extension — so signed-APK wizard output was never ignored.

Changes

• Reorganized into labelled sections and removed all duplicate entries.
• Ignore signed-APK wizard output: /*/release/, *.dm, *.aab. Scoped to module roots (/*/release/) deliberately, so it can never shadow an Android variant source set such as composeApp/src/release/.
• Added: .vscode/, google-services.json, *.hprof, *.tmp, *.swp, *.iws, *.pid, test-results/, test-reports/, .kotlin_cache/, kotlinc/, kotlin-tooling-box/, *.xcarchive, /gradle/gradle-daemon-jvm.properties.
• Added .claude/settings.local.json — previously only ignored via a contributor's global git ignore, so a fresh clone would have surfaced (and could have committed) machine-local settings.
• Preserved the existing Xcode negation block verbatim. Blanket *.xcodeproj / *.xcworkspace rules were deliberately not added: project.pbxproj, the shared scheme, and contents.xcworkspacedata are tracked, and a blanket rule would silently ignore any newly added file under the project.

Test plan

• git ls-files -i -c --exclude-standard returns empty — no tracked file is shadowed by the new rules.
• git check-ignore -v confirms composeApp/release/*.apk and composeApp/release/**/*.dm are ignored, while a hypothetical composeApp/src/release/res/values/strings.xml is not.
• Cloned the branch into a clean directory and ran ./gradlew :composeApp:assembleDebug with only ANDROID_HOME set (no local.properties) — builds successfully, confirming nothing the build needs is missing from a fresh checkout.
• Cross-checked every path = reference in iosApp.xcodeproj/project.pbxproj against the fresh clone; the only absent entries are the Worn.app / WornShareExtension.appex build products.
• No Gradle script reads local.properties, a keystore, or google-services.json, so ignoring them changes nothing for contributors.

Checklist

• Code follows the project's architecture and conventions
• Changes applied to both Android and iOS where applicable (n/a — no UI or platform code touched)
• No hardcoded user-facing strings (n/a)
• ./gradlew detekt passes (n/a — no Kotlin sources changed; verified via the fresh-clone build)
• Tests added/updated where relevant (n/a — tooling-only change, verified manually above)
• No generated or temporary files committed

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