feat: Support nested routes in ActivableRoute

[marc2332]

Closes #674
Depends on #672

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 215 lines in your changes missing coverage. Please review.

Project coverage is 74.01%. Comparing base (5c0f452) to head (b2fe634).
Report is 3 commits behind head on main.

❗ Current head b2fe634 differs from pull request most recent head 5d8813d

Please upload reports for the commit 5d8813d to get more accurate results.

Files	Patch %	Lines
crates/devtools/src/tabs/style.rs	0.00%	100 Missing ⚠️
crates/renderer/src/devtools.rs	0.00%	42 Missing ⚠️
crates/devtools/src/lib.rs	0.00%	36 Missing ⚠️
crates/devtools/src/tabs/tree.rs	0.00%	15 Missing ⚠️
crates/devtools/src/hooks/use_node_info.rs	0.00%	7 Missing ⚠️
crates/freya/src/launch.rs	0.00%	6 Missing ⚠️
crates/renderer/src/app.rs	0.00%	6 Missing ⚠️
crates/renderer/src/lib.rs	0.00%	2 Missing ⚠️
crates/devtools/src/node.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #675      +/-   ##
==========================================
+ Coverage   73.90%   74.01%   +0.10%     
==========================================
  Files         194      195       +1     
  Lines       19951    19922      -29     
==========================================
  Hits        14745    14745              
+ Misses       5206     5177      -29     

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