feat: add back link when jumping from key popover to a macro

[mondalaci]

Summary

• When jumping to a macro from the key action popover (Jump to macro / Assign new macro), show a Back to link above Used on: using the same keymap ⭢ layer ⭢ key breadcrumb style.
• Keeps jump-back navigation separate from the assignment list, as suggested in feat: show macro key assignments on the macro page #3002 (comment).
• Reuses the shared <back-to/> query-param pattern from module settings.

Test plan

• From a keymap key popover Macro tab, use Jump to macro and confirm a back link like Back to QWERTY for PC ⭢ Fn ⭢ G key appears above Used on:
• Click the back link and confirm it returns to the same keymap/layer/key with the popover open
• Use Assign new macro from the popover and confirm the same back link appears on the new macro page
• Open a macro from the side menu (no jump) and confirm no back link is shown; Used on: still works when assignments exist
• On the macro page with a back link, select/clear a macro action and confirm the back link remains
• Navigate from keymap to module settings and confirm Back to [name] keymap still works

Made with Cursor

[pcooke9]

Seems to work as expected in Win 11, thanks!