feat: UX improvements for web demo

[arjo129]

Based on user testing it was found that:

1. The reset button is flaky. For now, this is not a high priority thing to fix so we are disabling it.
2. A tooltip hinting to click on a robot was added.

Note: When testing remember to disable cache.

GenAI Use

We follow OSRA's policy on GenAI tools

• I used a GenAI tool in this PR.
• I did not use GenAI

Generated-by: Gemini

[mxgrey]

These UI changes are really nice improvements 👍

[mxgrey]

The CI gave a strange error:

--- stderr: rmf_path_server
error: failed to get `rstar` as a dependency of package `parry3d v0.21.1`
    ... which satisfies dependency `parry3d = "^0.21"` of package `mapf_post v0.1.0 (https://github.com/arjo129/mapf_post?branch=arjo%2Ffeat%2Fmore_efficient_checks#07a61faf)`
    ... which satisfies git dependency `mapf_post` of package `rmf_path_server v0.1.0 (/__w/next_gen_prototype/next_gen_prototype/next_gen_ws/src/next_gen_prototype/path_server/rmf_path_server)`

Caused by:
  failed to load source for dependency `rstar`

Caused by:
  unable to update registry `crates-io`

Caused by:
  download of rs/ta/rstar failed

Caused by:
  curl failed

Caused by:
  [16] Error in the HTTP2 framing layer
---

I'll have it rerun in case this is just an intermittent problem.

[arjo129]

The CI gave a strange error:

--- stderr: rmf_path_server
error: failed to get `rstar` as a dependency of package `parry3d v0.21.1`
    ... which satisfies dependency `parry3d = "^0.21"` of package `mapf_post v0.1.0 (https://github.com/arjo129/mapf_post?branch=arjo%2Ffeat%2Fmore_efficient_checks#07a61faf)`
    ... which satisfies git dependency `mapf_post` of package `rmf_path_server v0.1.0 (/__w/next_gen_prototype/next_gen_prototype/next_gen_ws/src/next_gen_prototype/path_server/rmf_path_server)`

Caused by:
  failed to load source for dependency `rstar`

Caused by:
  unable to update registry `crates-io`

Caused by:
  download of rs/ta/rstar failed

Caused by:
  curl failed

Caused by:
  [16] Error in the HTTP2 framing layer
---

I'll have it rerun in case this is just an intermittent problem.

Smells like network issues.