chore: one declaration per module, one source of defaults

[skjnldsv]

lib/custom.d.ts declared a module for every .vue file, which answers for this library's own components too: a component whose real types stop resolving quietly becomes any instead of failing the type check. It also declared *.svg?raw a second time, beside the one in shims.d.ts.

Deleting it outright does not work, and that is the interesting part: what it was actually holding up is vue-material-design-icons, whose types sit beside each component at a path its exports map does not offer, so nothing resolves them under bundler resolution.

lib/views/Viewer.vue(226,24): error TS7016: Could not find a declaration file for module 'vue-material-design-icons/Pencil.vue'

So that package is what is declared now, in the one shims file. Two tests keep it that way: no blanket *.vue, and no module declared in two places.

The rest is smaller. The viewer kept a second set of option defaults that open() replaced with the caller's options anyway, while every read already falls back per option. Both media components reloaded on the file's display name, where two files can carry one name (a version of a file reads as a date, a rename keeps the same node) and the source is what says which bytes to fetch. The empty jsdoc blocks that existed to satisfy jsdoc/require-jsdoc say something now, and the duplicated comment above modalElement() is gone.

Four tests fail without the changes: the two declaration guards and one per media component for the same-name reload. The defaults collapse and the comments are covered by the suite staying green.

👾 This pull request was assisted by Claude Code, commits carry an Assisted-by trailer.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.65%. Comparing base (4e7c229) to head (e1bdc29).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/components/Images.vue	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   83.34%   84.65%   +1.31%     
==========================================
  Files          36       36              
  Lines        2420     2425       +5     
  Branches      476      491      +15     
==========================================
+ Hits         2017     2053      +36     
+ Misses        399      369      -30     
+ Partials        4        3       -1     

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