chore: bump version to 0.3.0

[Shadow-Azure]

Problem

Ship a new release bundling the work merged since v0.2.8.

Solution

Bump the three manual version files (Cargo.toml, electron-app/package.json, release.sh) from 0.2.8 → 0.3.0. Per release/release-pipeline.md, npm packages/*/package.json versions are injected by CI from the git tag at publish time, so they are not bumped here.

Includes since v0.2.8:

• feat(skill): add upgrade command (0.2.9) #43 upgrade command
• docs: AI Agent + OpenClaw + 飞书实战工作流 #45 AI-agent + OpenClaw + 飞书 workflow
• feat(capture): resize + redraw-settle before screenshot #46 screenshot-subsystem fixes (bounded burst-wait settle + awaitFrame rAF-throttle fallback)

Test Plan

• Only the 3 manual version files changed; no code change.
• CI Gate passes on this PR; squash-merge → tag v0.3.0 → gh release create triggers release.yml (build + upload + npm publish).

🤖 Generated with Claude Code

[github-actions]

🔒 门禁检查结果

检查项	状态
Rust 格式化	✅ success
Rust Clippy	✅ success
Rust 测试 & 覆盖率	✅ success
前端测试 & 覆盖率	✅ success
Playwright E2E	✅ success
统一测试 (test.sh)	✅ success
安全检查	✅ success
发布模拟验证	✅ success
升级流程测试	✅ success
cli-box-skill 单元测试	✅ success

Rust 测试覆盖率

指标	覆盖率
行覆盖率	66.0%
分支覆盖率	0.0%

模块	行覆盖率
crates.cli-box-core.src.automation	███████████░░░░░░░░░ 58.3%
crates.cli-box-core.src	███████████░░░░░░░░░ 55.3%
crates.cli-box-core.src.daemon	██████████░░░░░░░░░░ 50.7%
crates.cli-box-core.src.capture	████████████████████ 100.0%
crates.cli-box-core.src.process	██████████░░░░░░░░░░ 54.7%
crates.cli-box-core.src.instance	███████████████████░ 99.1%
crates.cli-box-core.src.server	█████████████████░░░ 87.7%
crates.cli-box-core.src.sandbox	███████████████████░ 98.8%

详细报告见 Rust 覆盖率 artifact

前端测试覆盖率

指标	覆盖率
行覆盖率	████████████████░░░░ 78.0%
分支覆盖率	70.4%
函数覆盖率	74.2%
语句覆盖率	77.5%

文件	行覆盖率
src/tests/mocks/websocket.ts	██████████████████░░ 88.0%
src/tests/mocks/xterm.ts	████████████████████ 100.0%
src/main/daemon-bridge.ts	████████░░░░░░░░░░░░ 40.0%
src/renderer/api.ts	██████████████░░░░░░ 68.2%
src/renderer/screenshotSync.ts	████████████████████ 100.0%
src/renderer/scrollback.ts	██████████████████░░ 88.9%
src/renderer/tabState.ts	████████████████████ 100.0%
src/renderer/terminalBuffer.ts	████████████████████ 100.0%

详细报告见前端覆盖率 artifact

✅ 所有检查通过，可以合入

点击 Squash and merge 合并此PR