Fix terminal URL click fallback

[Jinwoo-H]

Summary

• add a direct terminal HTTP URL mouseup fallback for Cmd/Ctrl-clicks when xterm has not established hover link state
• split OSC and URL link routing out of the oversized terminal link handler module
• keep file-link fallback behavior separate and avoid double-opening URLs already handled by xterm

Testing

• pnpm vitest run --config config/vitest.config.ts src/renderer/src/components/terminal-pane/terminal-link-handlers.test.ts src/renderer/src/lib/terminal-links.test.ts
• pnpm run typecheck:web
• pnpm exec oxlint src/renderer/src/components/terminal-pane/terminal-link-handlers.ts src/renderer/src/components/terminal-pane/terminal-url-link-hit-testing.ts src/renderer/src/components/terminal-pane/terminal-osc-link-routing.ts src/renderer/src/components/terminal-pane/use-terminal-pane-lifecycle.ts src/renderer/src/components/terminal-pane/terminal-link-handlers.test.ts

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