[openrr-gui] Add text input to set duration and improve error handling about text input

[taiki-e]

cc #101

[codecov]

Codecov Report

Merging #210 (8204409) into main (ffc82d7) will decrease coverage by 0.60%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
- Coverage   20.86%   20.26%   -0.61%     
==========================================
  Files          76       76              
  Lines        4241     4367     +126     
  Branches      952      973      +21     
==========================================
  Hits          885      885              
- Misses       3037     3163     +126     
  Partials      319      319              

Impacted Files	Coverage Δ
openrr-gui/src/joint_position_sender.rs	0.00% <0.00%> (ø)
openrr-gui/src/style.rs	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ffc82d7...8204409. Read the comment docs.

[taiki-e]

openrr-gui-3.mov