Add keyed reactive repeaters

[timkpaine]

Add Each as a keyed structural binding with per-item and named ancestor scopes. Reconciliation reuses, inserts, removes, and reorders live component subtrees while bindings, Show conditions, reactive text, and action payloads resolve against the current item.

Inbound transports patches update only affected Store branches, with atomic fallback to the authoritative client mirror. Structural templates diff as opaque units, structural bindings can be rewired incrementally, and native DOM moves preserve opted-in custom-element state.

[github-actions]

Test Results

268 tests  +32   268 ✅ +32   22s ⏱️ -3s
 13 suites + 1     0 💤 ± 0 
  2 files   ± 0     0 ❌ ± 0 

Results for commit f92e52d. ± Comparison against base commit 1ecfd36.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 97.64706% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.95%. Comparing base (1ecfd36) to head (f92e52d).

Files with missing lines	Patch %	Lines
spaday/components/shell.py	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
+ Coverage   96.94%   96.95%   +0.01%     
==========================================
  Files          36       36              
  Lines        1900     1972      +72     
  Branches      138      146       +8     
==========================================
+ Hits         1842     1912      +70     
- Misses         36       38       +2     
  Partials       22       22              

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